diff --git a/scripts/frank-default-large.env b/scripts/frank-default-large.env
index 1c67057..00ed74a 100644
--- a/scripts/frank-default-large.env
+++ b/scripts/frank-default-large.env
@@ -12,19 +12,25 @@ PORT=7770
 # ~70GB headroom, so 2x262k quantized KV fits. Verify at startup.
 CTX_SIZE=524288
 PARALLEL=2
-# Spec: selected from the 2026-08-14 matrix (bench-spec-matrix.sh).
-# WINNER: draft-mtp alone, n_max=10, p_min off -> ~30 t/s, STABLE, no
-# premature stop.  Layered draft-mtp,ngram-mod was faster on paper (median
-# 133 t/s) but is non-deterministic (10-148 t/s) and shows a degenerate
-# instant-EOS (tok=0) -> the same premature-stop class that retired DFlash.
-# Rejected as production-unsafe.
+# Spec: draft-mtp uses the MTP drafter BUNDLED inside the target GGUF.
+# llama.cpp auto-detects it (b10411+).  DRAFT_FILE stays EMPTY.
+#
+# Winner = draft-mtp, n_max=5, p_min off.
+# Realistic-prompt tuning (2026-08-14, temp 0.8, production settings):
+#   n4 12.5 | n5 13.3 (PEAK) | n6 10.6 | n7 10.1 | n10 8.6 | baseline none 7.2.
+# The 54-config matrix (repetitive "fleet" prompt) reported n_max=10 ~30 t/s,
+# but that prompt MTP drafts almost perfectly; long drafts collapse to ~18%
+# acceptance on real writing, so n_max=10 is actually ~8.6 t/s there.
+# Layered draft-mtp,ngram-mod is faster on paper (matrix median 133 t/s) but
+# non-deterministic (10-148 t/s) and showed a degenerate instant-EOS -> the
+# same premature-stop class that retired DFlash. Rejected as production-unsafe.
+# p_min off: --spec-draft-p-min 0.8 was neutral to slightly worse for draft-mtp.
+# No premature-stop on realistic text at ubatch 256 (see batch notes below);
+# the earlier 'premature EOS' on the repetitive bench prompt was sampling
+# variance, not a corruption bug.
 SPEC_TYPE=draft-mtp
-# Bundled MTP: Qwen3.8 keeps the MTP head in the target GGUF. llama.cpp
-# auto-detects it (b10411+). DRAFT_FILE MUST stay EMPTY.
 DRAFT_FILE=
-# Draft length + sampling floor, from the spec matrix (n_max 2..10, p_min
-# off/0.8; p_min 0.8 did not help draft-mtp and slowed it slightly).
-SPEC_DRAFT_N_MAX=10
+SPEC_DRAFT_N_MAX=5
 SPEC_DRAFT_P_MIN=
 SPEC_NGRAM_MOD_N_MIN=48
 SPEC_NGRAM_MOD_N_MAX=64