I've trimmed a few of the other 30mm sounds and it seems (proof you can never ignore good ol reality check) that the MK108 (which btw historically couldn't be sync'd - fired thru prop) in AH fires at roughly 606rpm.. so the above sounds get out of sync. Only a problem if you fire very long (relatively for any shots where you ought to care about expenditure) bursts. Will need to run more tests to be sure of this lower ROF than "official" 650rpm.
Also seems AH sync'd 151/20s fire @ ~636rpm with the prop stopped. Tested only on the 152 but don't see why it wouldn't be about the same range of ROF within "official" 600-750 rpm ROF if the other 190s run at about the same rpms -- So the 151/20 sound could also be trimmed to sound pretty close to its actual rate.
Haven't checked if the gunfire sound duration can go much lower than with the old AH sound system, ~.9 sec