Not sure if it is just me, but I ran some low level speed tests and came across quite a change in the Spit V model. Cruise at low levels was a bit slower (2-3mph) but WEP speed had a HUGE improvement (like 14mph) over AH1 numbers.
Intentional? Modeling different boost, fuel, compression? Don't think it was the ground effect... hadn't noticed anything else like it with other aircraft in AH2 under similar conditions.
-Soda