diff --git a/src/Infrastructure/Control/FeedforwardConfigStore.cs b/src/Infrastructure/Control/FeedforwardConfigStore.cs
index 6dff65f..7743d96 100644
--- a/src/Infrastructure/Control/FeedforwardConfigStore.cs
+++ b/src/Infrastructure/Control/FeedforwardConfigStore.cs
@@ -57,7 +57,7 @@ public sealed class FeedforwardConfigStore : IFeedforwardConfigStore
                     Id                      = rd.GetInt32(0),
                     Name                    = rd.GetString(1),
                     Enabled                 = rd.GetBoolean(2),
-                    AdvisoryOnly            = rd.GetBoolean(31),
+                    AdvisoryOnly            = rd.GetBoolean(30),
                     FeedTag                 = rd.GetString(3).ToLowerInvariant(),
                     PressureTag             = rd.IsDBNull(4) ? null : rd.GetString(4).ToLowerInvariant(),
                     LevelTags               = levelTags,
diff --git a/src/Infrastructure/Control/FeedforwardEngine.cs b/src/Infrastructure/Control/FeedforwardEngine.cs
index 578589b..79b244f 100644
--- a/src/Infrastructure/Control/FeedforwardEngine.cs
+++ b/src/Infrastructure/Control/FeedforwardEngine.cs
@@ -252,7 +252,12 @@ public sealed class FeedforwardEngine
         }
         if (double.IsNaN(metric) && temps.Count >= 2 && temps[0].Good && temps[^1].Good)
         {
-            metric = DiffTemp.Delta(temps[0].Pct, temps[^1].Pct);
+            // temp_tags는 하단→상단 순서(예: tica-6111a..ti-6111d, 정상 A>B>C>D 단조감소).
+            // front metric = "상단−하단"(top−bottom): 프론트 상승(heavies 상승→상단 가열) 시 증가 →
+            // FrontPositionIndicator의 dev>0→"상승"→환류↑ 규약과 정합.
+            // [버그픽스] 이전 Delta(temps[0],temps[^1])=하단−상단은 부호 반대라 트림권고가 반전됐음(브레인스토밍 §10.2-A).
+            // ⚠ §10.2-B: temps[^1](ti-6111d)는 환류 서브쿨링 오염 가능 — 센서 선정/보정 재검토는 후속.
+            metric = DiffTemp.Delta(temps[^1].Pct, temps[0].Pct);
             strong = true;
         }
         if (double.IsNaN(metric)) return (null, null);
diff --git a/tests/ExperionCrawler.Tests/FeedforwardFrontTests.cs b/tests/ExperionCrawler.Tests/FeedforwardFrontTests.cs
index 54af80a..522eccd 100644
--- a/tests/ExperionCrawler.Tests/FeedforwardFrontTests.cs
+++ b/tests/ExperionCrawler.Tests/FeedforwardFrontTests.cs
@@ -37,4 +37,54 @@ public class FeedforwardFrontTests
         Assert.Contains("하강", state);
         Assert.Contains("boilup", trim);
     }
+
+    // ── ApplyFront 부호 규약 (브레인스토밍 §10.2-A 버그픽스 회귀) ──────────
+    // temp_tags = [A하단 … D상단], 정상 A>B>C>D 단조감소.
+    // front metric은 "상단−하단"이어야 함: 프론트 상승(heavies↑→상단 가열) 시 metric↑ → dev>0 → 상승/환류↑.
+    private static ColumnConfig FrontCfg() => new()
+    {
+        Id = 1, Name = "C-FRONT", Enabled = true, FeedTag = "f", ProductKey = "P", ScanSec = 2,
+        DTdP = 0.0, PRef = double.NaN, PressureTag = null,            // 압력경로 비활성 → pUnstable 없음
+        FeedMoveThresholdPerMin = 0.0,                               // moving 비활성 → transient 없음
+        TempTags = new[] { "a", "b", "c", "d" },
+        Streams = new[] { new StreamConfig { Key = "P", FlowTag = "ficq-6118", Role = StreamRole.Commanded, Grade = Confidence.A, TargetCoeff = 0.95 } }
+    };
+
+    private static PvSnapshot FrontSnap(double a, double b, double c, double d) => new(
+        new TagSample("f", 100, true, DateTime.UtcNow),
+        null,
+        Array.Empty<TagSample>(),
+        new Dictionary<string, TagSample> { ["P"] = new TagSample("ficq-6118", 95, true, DateTime.UtcNow) })
+        {
+            Temps = new[]
+            {
+                new TagSample("a", a, true, DateTime.UtcNow), new TagSample("b", b, true, DateTime.UtcNow),
+                new TagSample("c", c, true, DateTime.UtcNow), new TagSample("d", d, true, DateTime.UtcNow)
+            }
+        };
+
+    [Fact]
+    public void ApplyFront_top_warming_is_front_rise_reflux_advice()
+    {
+        var engine = new FeedforwardEngine();
+        var st = new ColumnState();
+        // 정상 단조감소(A=110>B>C>D=90)로 baseline 시드
+        for (int i = 0; i < 5; i++) engine.Tick(FrontCfg(), FrontSnap(110, 105, 100, 90), st, DateTime.UtcNow);
+        // 상단(D) 가열 = heavies 상승 = 프론트 상승 → 상승/환류↑ (버그였다면 하강/boilup로 반전)
+        var res = engine.Tick(FrontCfg(), FrontSnap(110, 105, 100, 100), st, DateTime.UtcNow);
+        Assert.Contains("상승", res.FrontPositionState);
+        Assert.Equal("환류↑ 권장", res.FrontTrimAdvice);
+    }
+
+    [Fact]
+    public void ApplyFront_top_cooling_is_front_fall_boilup_advice()
+    {
+        var engine = new FeedforwardEngine();
+        var st = new ColumnState();
+        for (int i = 0; i < 5; i++) engine.Tick(FrontCfg(), FrontSnap(110, 105, 100, 90), st, DateTime.UtcNow);
+        // 상단(D) 추가 냉각 = 프론트 하강 → 하강/boilup
+        var res = engine.Tick(FrontCfg(), FrontSnap(110, 105, 100, 80), st, DateTime.UtcNow);
+        Assert.Contains("하강", res.FrontPositionState);
+        Assert.Contains("boilup", res.FrontTrimAdvice);
+    }
 }