diff --git a/qwen3_6_scripts/patch_ops.sh b/qwen3_6_scripts/patch_ops.sh
index a7fc5714..19ba24e7 100755
--- a/qwen3_6_scripts/patch_ops.sh
+++ b/qwen3_6_scripts/patch_ops.sh
@@ -164,12 +164,13 @@ if [ -d "$_SITE" ]; then
 fi
 
 # ===========================================================
-# 5. XFormers patches — head_dim=256 bypass for BI-V100
-#    Comp 168 also had xformers patches (base uses xformers for attention)
+# 5. XFormers patches — DISABLED
+#    Sub 168 (base image) achieved output_tps=11.9 WITHOUT any xformers patches.
+#    Sub 520 applied these patches → output_tps=2.6 (4.6x slower!)
+#    The patches replace ixformer flash attention with pure PyTorch O(L²) matmul.
+#    Base image ixformer attention works correctly — proven by Sub 168.
 # ===========================================================
-python3 ./patch_xformers_sdpa_seq.py 2>&1 || true
-python3 ./patch_xformers_sdpa_batch.py 2>&1 || true
-echo "[patch_ops] xformers patches applied"
+echo "[patch_ops] xformers patches SKIPPED — base ixformer attention works (Sub 168 proof)"
 
 # ===========================================================
 # 6. model_runner patch (prefix_cache_hit fix)