Adjust carriage offsets to theoretically optimal values

src/ayab/encoders.h

@@ -82,24 +82,32 @@ constexpr uint8_t ALL_MAGNETS_CLEARED_RIGHT[NUM_MACHINES] = {199U, 199U, 130U};
 // For the garter carriage we need to see both magnets.
 constexpr uint8_t GARTER_SLOP = 2U;
 
+// KH9xx:
+//    - K=±16, L=±4, G=±8
+//    — add END_OFFSET (28)
+//    - for G add magnet distance (12)
+// KH270:
+//    - K=±9
+//    - add END_OFFSET (5)
+//    - add MAGNET_DISTANCE_270 (12)
 constexpr uint8_t START_OFFSET[NUM_MACHINES][NUM_DIRECTIONS][NUM_CARRIAGES] = {
     // KH910
     {
         // K,   L,   G
-        {42U, 32U, 32U}, // Left
-        {16U, 32U, 50U} // Right
+        {44U, 32U, 32U}, // Left
+        {12U, 24U, 48U} // Right
     },
     // KH930
     {
         // K,   L,   G
-        {42U, 32U, 32U}, // Left
-        {16U, 32U, 50U} // Right
+        {44U, 32U, 32U}, // Left
+        {12U, 24U, 48U} // Right
     },
     // KH270
     {
         // K
-        {28U, 0U, 0U}, // Left
-        {16U, 0U, 0U} // Right
+        {26U, 0U, 0U}, // Left
+        {8U, 0U, 0U} // Right
     }};
 
 // Should be calibrated to each device