1999 Nissan Maxima tire/wheel balance problem

1999 Nissan Maxima SE, mileage: 107,000. I have a tire/wheel balance problem w/ stock 215/55 16 wheels. Several facilities have tried to balance them successfully however they still are not perfect. Nothing bent or out of round. Tried a replacement wheel tire package, stock size, and $1800 later new wheels and tires sitting in garage. The shimmy occurs at 65 mph+. In addition, my brakes continue to warp. Replace front pads twice (all Nissan stock) and recently replaced rear. I do all highway miles and generally do high-speed stops (I’m a cop). Thought about replacing w/ performance friction carbon metallic. Any suggestions? (I like the brake feel and performance on 98 police Crown Victoria I drive, what kind of brakes). If replace with performance friction carbon metallic brake pads, do I need new rotors or can new pads be installed with resurface rotors. The shimmy is annoying and the brakes are just expensive. Suggestions please.