TomCat: I have just the opposite experience. I dived down in a Spit MkIa on a 109 that was running away on the deck, but couldn't get enough speed to catch him. He started climbing and I couldn't keep up with him. He gained separation and alt advantage (I did everything I could - emergency boost, trimming - no avail.
Then there are those real anecdotes on that spitfireperformance website that say a Spit outclimbed a 109 (Of course, that site is probably biased).
What I mean is that you should stop the personal attacks you and some others too, and give us some hard data. If it proves that something is wrong, I'm all for correcting it - not that it' up to me
But the fact that you got shot down by a better pilot online hardly proves anything. Mind you, I agree that current FM-s need a lot of fine tuning.