update config via chax's suggestion (for LT, etc)

keyboards/planck/rev6/chconf.h

@@ -58,7 +58,7 @@
  *          The value one is not valid, timeouts are rounded up to
  *          this value.
  */
-#define CH_CFG_ST_TIMEDELTA                 2
+#define CH_CFG_ST_TIMEDELTA                 0
 
 /** @} */
 

keyboards/planck/rev6/mcuconf.h

@@ -225,7 +225,7 @@
  * ST driver system settings.
  */
 #define STM32_ST_IRQ_PRIORITY               8
-#define STM32_ST_USE_TIMER                  4
+#define STM32_ST_USE_TIMER                  3
 
 /*
  * UART driver system settings.