PSM switch from 18's to 19's
 

I have a 987.1 Cayman. Recently I switched from 18's to 19's running 235/35/19 front and 265/35/19 rear Michelin PS4's. When I did a mountain run the car handled fine in lower speeds and tight turns, but at higher speed turns (not even going that hard) 65-75 mph the traction control kept coming on inducing power loss. Any thoughts?