Thank you SO much, Blackdog. That is the best explanation I have read on this thing.

One thing still bugs me though but it is likely my fault:

I go quick mission one of the last ones and jump into a 109 where theres a lot of blemheims and spits around

I fly a long time (20mins or so).

I end up slow on deck. Ok

Now it takes an eternity to accelerate from 250 kmh to something higher.

Also even though I have full throttle (no WEP tho) and full prop pitch, the pp doesnt go further than 22000 or 23000 ...