I hear ya. Didn't know about the knee. Sorry man. Not sure how much tighter you'll be able to make your current ride. In my experience, tires were everything. My wife leased a Toyota Camry, borrom of the barrel, and because the body of the car was so huge, the 4 cylinder engine and 17 inch wheels were totally inappropriate. Handling and turning at relatively high speeds made control challenging. Wish I could help your further man.
