diff --git a/crates/ml-alpha/src/cfc/trunk.rs b/crates/ml-alpha/src/cfc/trunk.rs
index 0db95639f..da2c82af6 100644
--- a/crates/ml-alpha/src/cfc/trunk.rs
+++ b/crates/ml-alpha/src/cfc/trunk.rs
@@ -101,6 +101,11 @@ pub struct CfcConfig {
     /// (X1) and the per-stack Mamba2Block constructions added in X3/X5.
     /// Default matches `PerceptionTrainerConfig::default().mamba2_state_dim`.
     pub mamba2_state_dim: usize,
+    /// X11: inference batch + sequence dims for the v2 forward buffers
+    /// allocated on the trunk. Backtesters typically use (1, 32);
+    /// training-time consumers (PerceptionTrainer) pass their own dims.
+    pub n_batch: usize,
+    pub seq_len: usize,
 }
 
 impl Default for CfcConfig {
@@ -110,6 +115,8 @@ impl Default for CfcConfig {
             n_hid: HIDDEN_DIM,
             cfc_n_in: HIDDEN_DIM,
             mamba2_state_dim: 16,
+            n_batch: 1,
+            seq_len: 32,
         }
     }
 }
diff --git a/crates/ml-alpha/src/trainer/perception.rs b/crates/ml-alpha/src/trainer/perception.rs
index 5e338b612..d238c3a2c 100644
--- a/crates/ml-alpha/src/trainer/perception.rs
+++ b/crates/ml-alpha/src/trainer/perception.rs
@@ -515,6 +515,8 @@ impl PerceptionTrainer {
                 n_hid: HIDDEN_DIM,
                 cfc_n_in: HIDDEN_DIM,
                 mamba2_state_dim: cfg.mamba2_state_dim,
+                n_batch: cfg.n_batch,
+                seq_len: cfg.seq_len,
             },
             cfg.seed,
         )