I have never been caught in dive in a A8 with a F6f to terminal speed, but that does not mean It couldn't be done.
Normally you don't have to dive against a Coalt CoE F6F since A8 on WEP is faster at all altitudes, and acceleration is better at combat speeds.
The Dora start to shake at 580mph, the A8 at 600mph so Dora's have a hard time catching the A8, but the F6F seem to start shaking at 600ish like the A8, maybe a bit strange since 190A8/D9 share the same wing.
Something is very suspicious with the A8 vs the F8 :
The A8 and the much heavier F8 have almost the same turning capabilities, only 14 yards differentiate them, and all the other parameters are the same for both planes (according to AH performance charts).
This makes me believe the performance charts for the A8 might the armoured variant, or a hybrid.
The armoured variant was close to impregnable to .50 calibre from front.