I have had my tc kicking in a little more the last week or two but the problem being is my driving style. The road's are full of salt and muck, not really had a good downpour of rain so i find the road surface very slippery. Most turning's i pull out from if i put my foot down even a little is causing my tc light to kick-in !!
I run standard 18's and there is nothing wrong with my tyres.
You have not had your car long, and imo these z's do not take much to have fun at the rear end even in the dry.
I am around tomorrow daytime if you have nothing to do and i will pop over and we can test our wheels/tyres even swap them over for a comparison if you want.