THANKS TO STAGA FOR PUTTING THE PICTURES ON HIS WEBSPACE!
I owe you one mate! (atleast one)

Ok, here are some facts, a chart and another nice speed comparison data between all different Ta152 types.
The first chart, speed diagram are from 1943, 2 years earlier then the Ta152 H-1 which entered service in January 1945.
The chart displays 3 curves, all Ta152's.
Remember, one, it's from 1943, 2, the Ta152's in here are TA152 A modells, the H modells had slightly better high performance.
The second diagram explains it self.
Second one bellow. Be sure to check the GM 1 boost speeds especially since it's those, that I THINK are what's been either not modelled, or slightly undermodelled in AH. GM 1 was used at altitudes above the maximum boost altitude. Mw 50 could only be used up to where the Maximum boost ended but not above.
What differed the H-0 from the H-1 was a few things, first, the H-1 used Jumo 213E-1 engine, the H-1 thus had both MW50 and GM boosts. The H-1 also had wing tanks, giving it a greater range then the P51D on internal.
Thus the H-1 had higher wingloading and turned a bit worse, but was better at high alt aswell as low alt, greater range aswell.
Something else that I think might be wrong is the fact that the H-0 modell had climb rate of 20 meters/s at sea level, although the H-1 was heavier the boost would bring this up to about the same but I need to do some more research about it.
One more thing, the H-1 used a field kit which was suplied by Junkers to units with Ta152's. It increased the horse power of the engine with 150.
All!