diff --git a/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/config.h b/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/config.h
index 924e45b5ff..e9fd63dd8e 100644
--- a/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/config.h
+++ b/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/config.h
@@ -3,6 +3,16 @@
 
 #pragma once
 
+// Tight, strict combo window for a simultaneous 3-key press.
+// This ensures the fallback combo only fires when intended.
+#define COMBO_TERM 10
+#define COMBO_STRICT_TIMER
+
+// Use a more conservative debounce period (20ms is standard for Keychron)
+// but since we switched to 'sym_defer_pk' in rules.mk, this will now
+// require 20ms of STABILITY before a keypress is reported.
+#define DEBOUNCE 20
+
 // Always resolve combo keycodes from BASE (layer 0) so the
 // COMM+DOT+SLSH fallback combo fires regardless of the active layer.
 #define COMBO_ONLY_FROM_LAYER 0
diff --git a/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/rules.mk b/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/rules.mk
index 256b50f150..a2e60506ae 100644
--- a/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/rules.mk
+++ b/keyboards/keychron/q5_max/ansi_encoder/keymaps/via/rules.mk
@@ -5,3 +5,5 @@ COMBO_ENABLE = yes
 CAPS_WORD_ENABLE = yes
 AUTOCORRECT_ENABLE = yes
 SRC += chord_unicode.c
+
+DEBOUNCE_TYPE = sym_defer_pk