100% of the time lowering it will improve performance, but you must improve everything else to go along with it. So set the ride height first than do everything else. Lowering it also makes it stiffer and the stiffness gives it less roll meaning greater chance of skidding or losing control easier. this is a problem with you as a drive from driving to aggressive, being too hard on brake when entering a corner and too hard on gas when exiting.
