As of the 1.07 Update to GT6 people have noticed changes in the way cars handle, TCS works and AI operate. I read on the undocumented changes post that someone was getting laps 2 second faster on average after the update. Myself and @MrGrado have noticed that, at least in the Team Joest Audi R18 around La Sarthe '13 it's possible to break later. Have any changes really been made that significantly messed with your "tried and true" tunes negatively or positively?