5% can be a lot with the types of numbers we deal with, but I don't remember it being anywhere near 5%, more like 0.05%. I have a list of all top speeds of all aircraft in AH, deck, medium alt, and high (I tested them all, same config, to 1mph in accuracy) and the F8 and A8 are tied within 3 mph at all speeds. The A8 was actually 1-2 mph faster at some alts. Also remember that, as with all AH planes, once you drop your bombs/rockets, all penalities associated with shackles/rails/racks, are gone. This isn't so when you've fired off your 30mm's in the outer wings, you still pay a penalty for the gun itself. This is why I've found the F8 to be a little more nimble, at least I feel so.
The problem really is, neither the F8 or A8 are very useful at what they should be relatively good at. Too many other planes are far more capable. Strafing is almost suicidal against GV's, at least with MG 151's, making both 190's unfavored. You're better to have something with 6+ .50's to ensure you land lots of hits and knock out something important, and the .50 is probably more likely to get a kill on an armoured GV anyway. Same goes for attacking structures, too many other planes are that much better. The A8 is a relatively good structure strafer, while the F8 actually can be useful with the 50kg (~110lb) bombs against structures. Problem is, a P-47D30 shows up with 2 1K's under the wings, rockets, 1 500lb'r under the fuselage, and 8 .50's and pretty much owns the A8, both as an attacker, and then as a fighter.
Unfortunate. Great discussion though, nice to see some discussion about these planes as they tend to be seldom seen or mentioned. My aircraft pages help pages had a recent update to the 190F8 and A8 so lots of what I've heard you say is right in line with what I was feeling.
-Soda
The Assassins.