diff --git a/studies/M1_Mirror/SAT3_Trajectory/1_setup/optimization_config.json b/studies/M1_Mirror/SAT3_Trajectory/1_setup/optimization_config.json
index 50fe837a..56664c6a 100644
--- a/studies/M1_Mirror/SAT3_Trajectory/1_setup/optimization_config.json
+++ b/studies/M1_Mirror/SAT3_Trajectory/1_setup/optimization_config.json
@@ -27,7 +27,7 @@
     {
       "name": "lateral_inner_angle",
       "expression_name": "lateral_inner_angle",
-      "min": 25.0,
+      "min": 20.0,
       "max": 30.0,
       "baseline": 26.79,
       "units": "degrees",
@@ -47,9 +47,9 @@
     {
       "name": "lateral_outer_pivot",
       "expression_name": "lateral_outer_pivot",
-      "min": 9.0,
-      "max": 12.0,
-      "baseline": 10.40,
+      "min": 4,
+      "max": 9,
+      "baseline": 5.5,
       "units": "mm",
       "enabled": true,
       "notes": "Outer lateral pivot position"
@@ -58,7 +58,7 @@
       "name": "lateral_inner_pivot",
       "expression_name": "lateral_inner_pivot",
       "min": 5.0,
-      "max": 12.0,
+      "max": 11.0,
       "baseline": 10.07,
       "units": "mm",
       "enabled": true,
@@ -67,8 +67,8 @@
     {
       "name": "lateral_middle_pivot",
       "expression_name": "lateral_middle_pivot",
-      "min": 15.0,
-      "max": 27.0,
+      "min": 12.0,
+      "max": 25.0,
       "baseline": 20.73,
       "units": "mm",
       "enabled": true,
@@ -117,11 +117,11 @@
     {
       "name": "blank_backface_angle",
       "expression_name": "blank_backface_angle",
-      "min": 4.1,
+      "min": 4.0,
       "max": 4.5,
-      "baseline": 4.15,
+      "baseline": 4.00,
       "units": "degrees",
-      "enabled": true,
+      "enabled": false,
       "notes": "Blank backface angle"
     },
     {
@@ -131,7 +131,7 @@
       "max": 620.0,
       "baseline": 534.00,
       "units": "mm",
-      "enabled": true,
+      "enabled": false,
       "notes": "Inner circular rib diameter"
     }
   ],
diff --git a/studies/M1_Mirror/SAT3_Trajectory/README.md b/studies/M1_Mirror/SAT3_Trajectory/README.md
index db6efdd9..3ea3efba 100644
--- a/studies/M1_Mirror/SAT3_Trajectory/README.md
+++ b/studies/M1_Mirror/SAT3_Trajectory/README.md
@@ -27,21 +27,23 @@ First production implementation of the **Zernike Trajectory Method** for M1 mirr
 - **spherical_rms_nm** - Spherical aberration (Z11)
 - **linear_fit_r2** - Physics model validation (should be ~1.0)
 
-### Design Variables (11 total)
+### Design Variables (9 enabled)
 
 | Parameter | Min | Max | Baseline | Units | Category |
 |-----------|-----|-----|----------|-------|----------|
-| lateral_inner_angle | 25.0 | 30.0 | 26.79 | deg | Lateral Support |
+| lateral_inner_angle | 20.0 | 30.0 | 26.79 | deg | Lateral Support |
 | lateral_outer_angle | 11.0 | 17.0 | 14.64 | deg | Lateral Support |
-| lateral_outer_pivot | 9.0 | 12.0 | 10.40 | mm | Lateral Support |
-| lateral_inner_pivot | 5.0 | 12.0 | 10.07 | mm | Lateral Support |
-| lateral_middle_pivot | 15.0 | 27.0 | 20.73 | mm | Lateral Support |
+| lateral_outer_pivot | 4.0 | 9.0 | 5.5 | mm | Lateral Support |
+| lateral_inner_pivot | 5.0 | 11.0 | 10.07 | mm | Lateral Support |
+| lateral_middle_pivot | 12.0 | 25.0 | 20.73 | mm | Lateral Support |
 | lateral_closeness | 9.5 | 12.5 | 11.02 | mm | Lateral Support |
 | whiffle_min | 30.0 | 72.0 | 40.55 | mm | Whiffle Tree |
 | whiffle_outer_to_vertical | 60.0 | 80.0 | 75.67 | deg | Whiffle Tree |
 | whiffle_triangle_closeness | 50.0 | 80.0 | 60.00 | mm | Whiffle Tree |
-| blank_backface_angle | 4.1 | 4.5 | 4.15 | deg | Geometry |
-| inner_circular_rib_dia | 480.0 | 620.0 | 534.00 | mm | Geometry |
+
+**Disabled (fixed at baseline):**
+- blank_backface_angle = 4.00 deg
+- inner_circular_rib_dia = 534.00 mm
 
 ### Optimizer Configuration
 - **Algorithm:** TPE (Tree-Parzen Estimator)
diff --git a/studies/M1_Mirror/SAT3_Trajectory/STUDY_REPORT.md b/studies/M1_Mirror/SAT3_Trajectory/STUDY_REPORT.md
index bd3a843a..05c70f26 100644
--- a/studies/M1_Mirror/SAT3_Trajectory/STUDY_REPORT.md
+++ b/studies/M1_Mirror/SAT3_Trajectory/STUDY_REPORT.md
@@ -12,7 +12,7 @@
 | Metric | Value |
 |--------|-------|
 | Algorithm | TPE (Tree-Parzen Estimator) |
-| Design Variables | 11 |
+| Design Variables | 9 (enabled) |
 | Total Trials | _pending_ |
 | Successful FEA | _pending_ |
 | Failed FEA | _pending_ |
@@ -41,15 +41,17 @@
 |-----------|------------|----------|-------|
 | lateral_inner_angle | _pending_ deg | 26.79 deg | _pending_ |
 | lateral_outer_angle | _pending_ deg | 14.64 deg | _pending_ |
-| lateral_outer_pivot | _pending_ mm | 10.40 mm | _pending_ |
+| lateral_outer_pivot | _pending_ mm | 5.5 mm | _pending_ |
 | lateral_inner_pivot | _pending_ mm | 10.07 mm | _pending_ |
 | lateral_middle_pivot | _pending_ mm | 20.73 mm | _pending_ |
 | lateral_closeness | _pending_ mm | 11.02 mm | _pending_ |
 | whiffle_min | _pending_ mm | 40.55 mm | _pending_ |
 | whiffle_outer_to_vertical | _pending_ deg | 75.67 deg | _pending_ |
 | whiffle_triangle_closeness | _pending_ mm | 60.00 mm | _pending_ |
-| blank_backface_angle | _pending_ deg | 4.15 deg | _pending_ |
-| inner_circular_rib_dia | _pending_ mm | 534.00 mm | _pending_ |
+
+**Fixed parameters (not optimized):**
+- blank_backface_angle = 4.00 deg
+- inner_circular_rib_dia = 534.00 mm
 
 ---