Something about the K4 speed at high altitude

[ImpalerNL]

Looking at the bf109K4 il2 compare graphs, there is a bigger difference at 100 and 110% compared to the K4-C3, the G10 and the G14.
The other mw50 powered bf109s have a 25km/h speed difference between 100 and 110%, while the K4 has a 45km/h speed difference between 100 and 110%.
This speed difference of 20km/h~ is very obvious, comparing to the other mw50 powered bf109s and it could use a fix.
This would mean less overheating and better performance.