diff --git a/scripts/frank-primary.env b/scripts/frank-primary.env
index e458def..266c51d 100644
--- a/scripts/frank-primary.env
+++ b/scripts/frank-primary.env
@@ -37,15 +37,8 @@
 #   (shrinking needs a restart); `ft ctl stats` reports pool occupancy.
 # - KV MATH: 12 full-attention layers x 2 KV heads x 256 head_dim x 2 (K+V)
 #   x 2 B = 24 KiB/token (f16 KV; the 36 GDN layers use fixed per-seq state,
-#   not per-token KV). FRANK_PRIMARY_FT_NUM_TOKENS=300000 -> ~7.2 GiB.
-#   Harness worst case = 140,492-token prompt + 36,864 max_tokens = 177,356
-#   < 300,000; one NATIVE 262,144-token conversation + full budget also fits.
-# - PLE: the ~47.7 GiB ngram-embedding table pins in HOST RAM by default
-#   (--ple-backend disk is the alternative); the unit's LimitMEMLOCK=infinity
-#   makes the pin legal. TENS of GiB of pinned pages are why this stays a
-#   ROOT unit — see frank-primary.service.
-
-# --- Identity (deploy + serve contract) --------------------------------
+#   not per-token KV). See FRANK_PRIMARY_FT_NUM_TOKENS below for the pool
+#   size and its measured page-size law.
 FRANK_PRIMARY_IMAGE=localhost/frank-primary-freetoken:pr587-77a7201
 FRANK_PRIMARY_MODEL_DIR=/home/dank/models/Qwen3.8-Flash-Next-Uncensored-FP8
 FRANK_PRIMARY_MODEL_SHARDS=131
@@ -62,9 +55,14 @@ FRANK_PRIMARY_PUBLISH=7770:7770
 # the in-container index 0 IS the right card; --gpu 0 selects it.
 FRANK_PRIMARY_FT_GPU=0
 # KV pool in TOKENS (not bytes — vLLM-era FRANK_PRIMARY_KV_BYTES is gone).
-# 300,000 tokens x 24 KiB = 7.2 GiB; clears the harness worst case 177,356.
-# Grows live with `ft ctl cache --kv <n>`; shrink needs a restart.
-FRANK_PRIMARY_FT_NUM_TOKENS=300000
+# 299,968 tokens x 24 KiB = 7.0 GiB; clears the harness worst case
+# (177,356 tokens) and one NATIVE 262,144-token conversation + full budget.
+# MEASURED FIRST BOOT (2026-10-05): the auto attention backend is
+# qsa_sparse, which OVERRIDES page size to 64, so --num-tokens must be a
+# MULTIPLE OF 64 — 300,000 was refused ("nearest valid values: 299968 or
+# 300032"). Grows live with `ft ctl cache --kv <n>`; shrink needs a
+# restart.
+FRANK_PRIMARY_FT_NUM_TOKENS=299968
 # Concurrent decode slots. 2 is the first-boot conservative value; the
 # radix pool admits ~2 full-length 200,704-token conversations. Raise with
 # --max-running-requests only after a real-traffic look at slot occupancy.