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Personally I find their speed unchanged to be realistic.

maybe set them to about 99 or 98%, but If you take the time to trim your plane out, you can go about the same speed as they.

In real life pilots were trained even in combat to adjust their trim for the best speed and diving charachteristics.

Just my opinion.

Fair enough, but that doesn't account for the fact that they can run 110power + WEP on a tempest for an hour sortie.

Another thought however, any way to change the AI's actions when attacking bombers?

and likewise, the actions bombers take when attacked?

Probably, yes.

and lastly, if one AI is chasing another AI, the evading AI will take appropriate action, however, will the persuing AI take appropriate action to follow?

Yessir.