diff --git a/.packwizignore b/.packwizignore
index 4369c97..c68b308 100644
--- a/.packwizignore
+++ b/.packwizignore
@@ -65,11 +65,7 @@ config/paxi/datapacks/*
 # Default Options copies them into place client-side, only when the target is absent.
 !config/defaultoptions
 !config/defaultoptions/**
-# Server spawn tuning (analysis/client-perf/SPAWN-TUNING.md); partial files, the mods
-# fill in defaults for every other key. Enforced: the server reads them from here.
-!config/alexsmobs-common.toml
-!config/fowlplay.json5
-!config/crittersandcompanions-common.json5
+# Spawn tuning reverted 2026-10-18: bench B14 showed no measurable load reduction.
 # ModernFix mixin overrides (build.py SHIP; enforced - ModernFix reads it before
 # Default Options runs). dynamic_resources=true per bench B6.
 !config/modernfix-mixins.properties
diff --git a/config/alexsmobs-common.toml b/config/alexsmobs-common.toml
deleted file mode 100644
index 2bd64f1..0000000
--- a/config/alexsmobs-common.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-# Onion MC spawn tuning (analysis/client-perf/SPAWN-TUNING.md). Partial file: NeoForge
-# fills every other key with its default on load. Halves only the common mobs that are
-# heavy by weight x hard-coded group size; rare mobs keep their defaults.
-[spawning]
-	gazelleSpawnWeight = 20
-	capuchinMonkeySpawnWeight = 14
-	elephantSpawnWeight = 15
-	straddlerSpawnWeight = 35
-	rockyRollerSpawnWeight = 30
-	underminerSpawnWeight = 25
-	blobfishSpawnWeight = 15
-	mudskipperSpawnWeight = 14
-	caimanSpawnWeight = 15
diff --git a/config/crittersandcompanions-common.json5 b/config/crittersandcompanions-common.json5
deleted file mode 100644
index 99e4099..0000000
--- a/config/crittersandcompanions-common.json5
+++ /dev/null
@@ -1,51 +0,0 @@
-// Onion MC spawn tuning (analysis/client-perf/SPAWN-TUNING.md). Partial file: YACL keeps
-// defaults for missing keys. Each listed rule list REPLACES that mob's defaults, so every
-// biome rule of a changed mob is listed. configVersion 2 skips the v1->v2 migration.
-{
-  "configVersion": 2,
-  "spawning": {
-    "leaf_insect": [
-      {"biome_spec": "#c:is_jungle", "weight": 8, "min": 1, "max": 1},
-      {"biome_spec": "#c:is_forest", "weight": 4, "min": 1, "max": 1}
-    ],
-    "sea_bunny": [
-      {"biome_spec": "minecraft:ocean", "weight": 10, "min": 1, "max": 2},
-      {"biome_spec": "minecraft:deep_ocean", "weight": 10, "min": 1, "max": 2},
-      {"biome_spec": "minecraft:warm_ocean", "weight": 20, "min": 1, "max": 3},
-      {"biome_spec": "minecraft:lukewarm_ocean", "weight": 10, "min": 1, "max": 3},
-      {"biome_spec": "minecraft:deep_lukewarm_ocean", "weight": 10, "min": 1, "max": 3}
-    ],
-    "dragonfly": [
-      {"biome_spec": "#c:is_river", "weight": 4, "min": 1, "max": 1},
-      {"biome_spec": "#c:is_swamp", "weight": 5, "min": 1, "max": 1},
-      {"biome_spec": "#c:is_lush", "weight": 6, "min": 1, "max": 1}
-    ],
-    "ladybug": [
-      {"biome_spec": "#c:is_forest", "weight": 4, "min": 1, "max": 3},
-      {"biome_spec": "#c:is_lush", "weight": 6, "min": 1, "max": 2},
-      {"biome_spec": "#c:is_floral", "weight": 7, "min": 1, "max": 2}
-    ],
-    "stag_beetle": [
-      {"biome_spec": "#c:is_forest", "weight": 3, "min": 1, "max": 2},
-      {"biome_spec": "#c:is_lush", "weight": 6, "min": 1, "max": 2}
-    ],
-    "roly_poly": [
-      {"biome_spec": "#c:is_forest", "weight": 3, "min": 1, "max": 3},
-      {"biome_spec": "#c:is_lush", "weight": 6, "min": 1, "max": 2},
-      {"biome_spec": "#c:is_swamp", "weight": 6, "min": 1, "max": 2}
-    ],
-    "snail": [
-      {"biome_spec": "#c:is_forest", "weight": 3, "min": 1, "max": 2},
-      {"biome_spec": "#c:is_lush", "weight": 5, "min": 1, "max": 2},
-      {"biome_spec": "#c:is_swamp", "weight": 6, "min": 1, "max": 2}
-    ],
-    "stick_bug": [
-      {"biome_spec": "#c:is_forest", "weight": 3, "min": 1, "max": 2},
-      {"biome_spec": "#c:is_lush", "weight": 6, "min": 1, "max": 2}
-    ],
-    "weevil": [
-      {"biome_spec": "#c:is_forest", "weight": 3, "min": 1, "max": 3},
-      {"biome_spec": "#c:is_lush", "weight": 6, "min": 1, "max": 2}
-    ]
-  }
-}
diff --git a/config/fowlplay.json5 b/config/fowlplay.json5
deleted file mode 100644
index 79d66b1..0000000
--- a/config/fowlplay.json5
+++ /dev/null
@@ -1,13 +0,0 @@
-// Onion MC spawn tuning (analysis/client-perf/SPAWN-TUNING.md). Partial file: YACL keeps
-// defaults for every missing key and re-saves. Targets the waterfowl/gull/sparrow flocks
-// behind Fowl Play #214; songbirds and raptors keep their defaults.
-{
-  "duckSpawnWeight": 2,
-  "duckMaxGroupSize": 4,
-  "gooseSpawnWeight": 2,
-  "gooseMaxGroupSize": 3,
-  "gullSpawnWeight": 3,
-  "gullMaxGroupSize": 5,
-  "sparrowSpawnWeight": 12,
-  "sparrowMaxGroupSize": 4
-}
diff --git a/index.toml b/index.toml
index eb6d6f1..0391714 100644
--- a/index.toml
+++ b/index.toml
@@ -4,14 +4,6 @@ hash-format = "sha256"
 file = "config/akashictome-common.toml"
 hash = "4e479c86ddfec0c5e28f07034f033a10abae404309f38ccc4bfc15da9de2dfa2"
 
-[[files]]
-file = "config/alexsmobs-common.toml"
-hash = "bc47ee67032ceab8b2b408819ce9b268812f37da8f13b9b7efeae0deed607c4b"
-
-[[files]]
-file = "config/crittersandcompanions-common.json5"
-hash = "1ac5a9b392b3aa980abe86b37aa8a9853e91c02cd18f8a1bceea0d08fe3f10c4"
-
 [[files]]
 file = "config/defaultoptions/extra/config/DistantHorizons.toml"
 hash = "8949bf3c7a43df7a7ae384213db0985425db3559219c29cb63eaef45c7962dcc"
@@ -44,10 +36,6 @@ hash = "9b75828543ed2b8cc5804eabecdc28262297a90d6f0e8e771d64ff779a69e3c9"
 file = "config/defaultoptions/options.txt"
 hash = "62034e0589087dab02d1a15192ad313a57f907d5ee9ebbf8853151f7831851a1"
 
-[[files]]
-file = "config/fowlplay.json5"
-hash = "09ad767a358310e9d38e632ba0e670b0afd1554c162eadb6928d106df17b66c3"
-
 [[files]]
 file = "config/modernfix-mixins.properties"
 hash = "ca92e91a2d856d42e4a5b1ba1900fbed0e942bcbeddd75c0195a2375ade75695"
@@ -618,11 +606,6 @@ file = "mods/fishermans-haven.pw.toml"
 hash = "d72a60c2053f10a447bdd05577674eeb8d0253a3ca02cb40776e063db556dda2"
 metafile = true
 
-[[files]]
-file = "mods/flerovium.pw.toml"
-hash = "9ab20de2d63037f055d6b614013389e0198068bab536dfd62eebd913e5222fe1"
-metafile = true
-
 [[files]]
 file = "mods/fowlplay.pw.toml"
 hash = "549e72a053da13a50404bd0901b75ce25c6045e778d5a89afcf58e9b5e1945f5"
diff --git a/mods/flerovium.pw.toml b/mods/flerovium.pw.toml
deleted file mode 100644
index 42e3457..0000000
--- a/mods/flerovium.pw.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-name = "Flerovium"
-filename = "flerovium-neoforge-1.21.1-1.1.2-all.jar"
-side = "client"
-
-[download]
-url = "https://cdn.modrinth.com/data/4Rh1Mobu/versions/oU1q3eIj/flerovium-neoforge-1.21.1-1.1.2-all.jar"
-hash-format = "sha512"
-hash = "6301ea6991768832fa983f61e1b0574336aea4920e027632a3df93c8a10f5d87041876fad516d16827d9cd13a84b5a8c334c1a0076ca04121e321939d5d6ea52"
-
-[update]
-[update.modrinth]
-mod-id = "4Rh1Mobu"
-version = "oU1q3eIj"
diff --git a/pack.toml b/pack.toml
index d0af8da..2f1d2fc 100644
--- a/pack.toml
+++ b/pack.toml
@@ -6,7 +6,7 @@ pack-format = "packwiz:1.1.0"
 [index]
 file = "index.toml"
 hash-format = "sha256"
-hash = "1ec4be75b6fe3d25a6d80d8274baea07b9b0f84300a56a8d101108980199f05e"
+hash = "07463f2d8920a7a3ec3f9b3d7d5f0883ed265d3bc8c34e0c956b09d8ce277814"
 
 [versions]
 minecraft = "1.21.1"