Well, I have a book Finnish Aerial Gunnery Manual from 1952 where it is stated the in eg. electrically primed system if the gun ROF is 1200 RPM and prop revs happen to be 1200 the gun fires at max ROF. If the prop rpm increases the gun cannot fire on same ROF but in roughly half ROF. As the prop RPM increases so does the gun ROF until at 2400 RPM the gun fires at its max ROF (1200) again.
Also, AFAIK some guns suffered quite a bit more than 10% drop in ROF due to bad synchronization.
If the gun fires at 1600 RPM I'd like to hear the ripping noise and not what ever "ROF" the sound file happens to play. It is quite common for eg. MK108 to have a sound file which resembles more a 40mm AAA gun and not the 650 RPM it was able to achieve IRL.
-C+