diff --git a/app/services/backtest_service.py b/app/services/backtest_service.py
index 03995eb..f0eaff1 100644
--- a/app/services/backtest_service.py
+++ b/app/services/backtest_service.py
@@ -137,6 +137,10 @@ SR_RESEARCH_VARIANTS = {
     "soft_zones",
     "confirmed_rounds",
     "gate_v2",
+    "rewrite_legacy_primary",
+    "soft_zones_legacy_primary",
+    "confirmed_rounds_legacy_primary",
+    "gate_v2_legacy_primary",
 }
 
 
@@ -268,10 +272,11 @@ def _window_setups(
         return []
 
     sr_variant = _sr_research_variant()
-    if sr_variant in {"production_control", "rr_aligned_control"}:
+    detector_variant = sr_variant.removesuffix("_legacy_primary")
+    if detector_variant in {"production_control", "rr_aligned_control"}:
         detected_levels = detect_sr_levels_legacy(highs, lows, closes, volumes)
     else:
-        detector_cap = 0 if sr_variant == "gate_v2" else MAX_LEVELS
+        detector_cap = 0 if detector_variant == "gate_v2" else MAX_LEVELS
         detected_levels = detect_sr_levels(
             highs, lows, closes, volumes, max_levels=detector_cap
         )
@@ -281,11 +286,11 @@ def _window_setups(
 
     gate_levels = _gate_eligible_levels(
         sr_levels,
-        confirmed_rounds_only=sr_variant in {"confirmed_rounds", "gate_v2"},
+        confirmed_rounds_only=detector_variant in {"confirmed_rounds", "gate_v2"},
     )
     zone_strength_mode = (
         "soft"
-        if sr_variant in {"soft_zones", "confirmed_rounds", "gate_v2"}
+        if detector_variant in {"soft_zones", "confirmed_rounds", "gate_v2"}
         else "sum"
     )
 
@@ -326,7 +331,7 @@ def _window_setups(
         targets = _prune_floor_pinned_targets(targets)
         primary_min_rr = (
             1.5
-            if sr_variant == "production_control"
+            if sr_variant == "production_control" or sr_variant.endswith("_legacy_primary")
             else float(activation.get("min_rr", 0.0))
         )
         primary = _select_primary_target(
diff --git a/docs/research/sr-levels-and-exits.md b/docs/research/sr-levels-and-exits.md
index 12dcdba..d27da95 100644
--- a/docs/research/sr-levels-and-exits.md
+++ b/docs/research/sr-levels-and-exits.md
@@ -436,6 +436,17 @@ calls `scripts/compare_sr_variants.py` to produce the paired cohort CSV and JSON
 > the test period. The simulator now treats `BACKTEST_ENTRY_END` as an inclusive
 > entry bound and truncates the calendar after the final position can resolve.
 
+The isolated `rr_aligned_control` validation also failed (Sharpe 2.78 to 1.32,
+CAGR 73.3% to 33.1%, drawdown 11.7% to 18.4%). The live 1.5 primary-selection
+behavior is therefore frozen: although it predates the 2.0 activation gate, it
+acts as a useful selectivity mechanism. The final detector matrix holds that
+behavior constant and varies only detection/zone policy:
+
+- `rewrite_legacy_primary`
+- `soft_zones_legacy_primary`
+- `confirmed_rounds_legacy_primary`
+- `gate_v2_legacy_primary`
+
 The post-2024 interval has informed earlier research, so this is validation rather
 than a pristine holdout; do not sweep variants on it. No deployment follows
 automatically. A lower validation Sharpe or higher drawdown remains a no-ship
diff --git a/scripts/run_backtest_snapshot.py b/scripts/run_backtest_snapshot.py
index 859d280..3f5953e 100644
--- a/scripts/run_backtest_snapshot.py
+++ b/scripts/run_backtest_snapshot.py
@@ -51,6 +51,8 @@ def _parse_args() -> argparse.Namespace:
         choices=(
             "production_control", "rr_aligned_control", "rewrite",
             "soft_zones", "confirmed_rounds", "gate_v2",
+            "rewrite_legacy_primary", "soft_zones_legacy_primary",
+            "confirmed_rounds_legacy_primary", "gate_v2_legacy_primary",
         ),
         default=None,
         help="Research-only S/R detector/gate arm.",
diff --git a/scripts/run_sr_v2_matrix.py b/scripts/run_sr_v2_matrix.py
index f5f4286..eba9df4 100644
--- a/scripts/run_sr_v2_matrix.py
+++ b/scripts/run_sr_v2_matrix.py
@@ -17,17 +17,12 @@ RUNNER = ROOT / "scripts" / "run_backtest_snapshot.py"
 COMPARE = ROOT / "scripts" / "compare_sr_variants.py"
 TRAINING_ARMS = (
     "production_control",
-    "rr_aligned_control",
-    "rewrite",
-    "soft_zones",
-    "confirmed_rounds",
-    "gate_v2",
-)
-# confirmed_rounds failed the post-2024 validation decisively and must not be
-# selected again merely because a corrected training curve looks attractive.
-LOCKABLE_ARMS = tuple(
-    arm for arm in TRAINING_ARMS[1:] if arm != "confirmed_rounds"
+    "rewrite_legacy_primary",
+    "soft_zones_legacy_primary",
+    "confirmed_rounds_legacy_primary",
+    "gate_v2_legacy_primary",
 )
+LOCKABLE_ARMS = TRAINING_ARMS[1:]
 
 
 def _add_common(parser: argparse.ArgumentParser) -> None: