Hi Luftwoller,
please provide us a video of your dogfight, so we can see, what's going on.
I don't have any problems with high temps in the Bf109.
In my opinion, we all using high powersettings to often. That was not the case in WW2. If you watch the video of Erich Brunotte, he espsecially mentions this, he flew with max. 1,2 ata in combat. Cruising speed with 0,9 - 1,0 ata, if i remember correctly.