Fixed the combo num layer issue, it was because the combo was not hold-only. Adjusted the combo term for the num layer combo to be a bit larger at 150

keyboards/keebio/iris_lm/keymaps/drew/alias.h

@@ -21,7 +21,7 @@ enum CustomKeycodes {
 #define ZOOM_OUT C(KC_MINS)
 
 // layers
-#define NUM MO(_NUM)
+#define NUM MO(_NUM) // used by the NumCombo combo
 #define SYM_BSPC LT(_SYM, KC_BSPC)
 #define NAV_TAB LT(_NAV, KC_TAB)
 #define FN_LAUNCH LT(_FUNC, LAUNCH)

keyboards/keebio/iris_lm/keymaps/drew/combos/combos.c

@@ -5,12 +5,14 @@
 uint16_t get_combo_term(uint16_t combo_index, combo_t* combo) {
     switch (combo_index) {
         case NumCombo:
-            return 75; // make a larger window for triggering the combo
+            return 150; // make a larger window for triggering the combo
             break;
     }
     return COMBO_TERM;
 }
 
+// necessary to make sure the layers are turned off for the NUM layer combo, since the original
+// layer keys are consumed by the combo activation
 bool process_combo_key_release(
     uint16_t combo_index, combo_t* combo, uint8_t key_index, uint16_t keycode
 ) {
@@ -31,6 +33,16 @@ bool process_combo_key_release(
     return false;
 }
 
+// necessary for the NUM layer combo, since it shouldn't trigger on a tap
+bool get_combo_must_hold(uint16_t combo_index, combo_t* combo) {
+    switch (combo_index) {
+        case NumCombo: // make the NUM layer combo hold-only
+            return true;
+            break;
+    }
+    return false;
+}
+
 bool process_combo_key_repress(
     uint16_t combo_index, combo_t* combo, uint8_t key_index, uint16_t keycode
 ) {

keyboards/keebio/iris_lm/keymaps/drew/config.h

@@ -12,6 +12,7 @@
 #define COMBO_PROCESS_KEY_RELEASE
 #define COMBO_PROCESS_KEY_REPRESS
 #define COMBO_TERM_PER_COMBO
+#define COMBO_MUST_HOLD_PER_COMBO
 
 #define CAPS_WORD_IDLE_TIMEOUT 0
 

keyboards/keebio/iris_lm/keymaps/drew/keymap.c

@@ -178,11 +178,11 @@ bool process_record_user(uint16_t keycode, keyrecord_t* record) {
             break;
 
         case KC_SPC:
+            // have to implement this here instead of as a key override because it was acting
+            // weird with layers as a key override
             if (get_highest_layer(layer_state) == _GAME) {
                 return true; // return early
             }
-            // have to implement this here instead of as a key override because it was acting
-            // weird with layers as a key override
             if (record->event.pressed) {
                 uint8_t mods = get_mods();
                 if ((mods | get_oneshot_mods()) & MOD_MASK_CTRL) {

keyboards/keebio/iris_lm/keymaps/drew/layers/layers.c

@@ -17,8 +17,9 @@ layer_state_t layer_state_set_user(layer_state_t state) {
         }
     } else if (IS_LAYER_ON_STATE(state, _NUM)) {
         NUM_latched = true;
-        state |= 1 << _NAV | 1 << _SYM; // turn on NAV and SYM too
+        // turn on NAV and SYM too, since the layer keys were consumed by the combo activation
+        state |= 1 << _NAV | 1 << _SYM; 
     }
 
     return state;
-}
+}

keyboards/keebio/iris_lm/keymaps/drew/taphold/taphold_options.c

@@ -13,6 +13,7 @@ uint16_t get_quick_tap_term(uint16_t keycode, keyrecord_t* record) {
     return QUICK_TAP_TERM;
 }
 
+// TODO: remove
 // bool get_hold_on_other_key_press(uint16_t keycode, keyrecord_t* record) {
 //     switch (keycode) {
 //         case NUM_SPC: