I doubt you wired it wrong.
Wiring from coil to other coils through connectors back to board in the head good ?
Right number coil ? Coil stop or rubber grommet where plunger rests there ? ( if not plunger rides too low in coil and doesn't get as full whack ).
Look over your two loud knockers in the other games and see if there is anything obvious such as material, location, etc.
Or try swapping one of the loud ones into your game and see if it's different.
LTG