I agree with MugenR. I went from the stock 55 to a 40 and it was a night and day difference in ride quality. The 45 to 35 would be insane! I know someone with a 35 series and he comments on how he has to avoid railroad tracks all the time.

Your stock side wall is about 2 inches. The 235/35 would drop to 1.6 inches! A 245/40 would stay at 1.9 inches. Although overall height would increase, the ride quality should not change much.