What size tires are your running pappadoc? Even with 22's that 'nut' youre talking about should be fine. In regards to your gear change problem, I say drive around more (non agressive) and let you car adapt to the ride. When going from stock 18's (if you have a C that is) to 22's theres going to be a noticable change in the ride. Youll get used it after a while.....by the way, got any pics of your car?