The tire size incresse may be causeing the brakes to not work properly and you sould get bigger and better brakes to make up the difference of the extra weight because of the rims. That should take care of the problem MAYBE i am not 100% sure but i think the added weght might be it.
brakes
My 05 (sedan) just had new wheels and tires, 17 inch, put on. When braking I now feel a slight pulse in the brake pedal at 45MPH and over and then it fades away. No vibrations at highway speeds when not on the brake.Feels like a warped rotor but I never felt it with the 15 inch stock tires. Car has 400 miles on it. Anyone know if they have come through with bad rotors. Thanks for your thoughts. 
