Well, I never thought the Spit IA with fabric ailerons was supposed to out roll a 109E anyways, so if thats the "nerfing", than im ok with that. It seems to me to be as comparable to a 109E as it should be.
I rolled them both @ 220-240 TAS at sea level, Spit IA rolls 360 in @ 6-7 seconds, a 109E does it in maybe 5 seconds. Seems to be close to what the data indicates they should do.
Maybe somebody can do some more in depth tests.