Oh it absolutely happened. Widewing actually compared the turning circles pre and post patch and there was a HUGE difference. Most of the stink was made with regards to the P-51 though, which was also drastically impacted for the worse. The P-51 would absolutely tear up any of the P-47s in a knife fight before that patch, and after it the P-51 was easy meat for a P-47, or anything else bar a 190.
Widewing we need you and your report!
My bet is IF the turning radius was nerfed, it was based on flight testing reports made by US or UK with a rough running or misadjusted-aileron trim tab-captured 190F thats been mistaken for an A model (NOT saying that is why it was nerfed, one can only
speculate till we get a reason from the higher-ups, and thats only if the turn radius if found to have changed per Widewing's studies)
The 190 would stall like ours do if The aileron trim tabs were not adjusted correctly on the ground. When properly adjusted, the aileron would "catch" the stall, and the little 190 would turn as tight, if not tighter than an La5 or Yak