Pick Your Poison

I lowered the car 1.5" in the front and 2" in the rear and the car rides a little rough, I'm a little afraid of getting the lift bars because it may take what little ride I have left. My tire size is 265/35r18 I was just considering upping the size to 275/40r18 for a little better ride, and as of better control arms go I'm afraid to get those because they may not do the job.I don't know whats wrong with the car, when it was stock it would just burn out also I couldn't give it any gas off the line. I have a sport edition mustang gt, the car would scratch from 2nd to 3rd stock! My brother and I took our cars to the track stock, he has a 2002 gt and he had some traction, and he ran a 14.5 at 96mph I had none and ran a 14.6 at 99mph. Off the start I can't give the car any gas at all, as a matter of fact I have to ease through first then shift to 2nd and thats where I gas it all the way. The cars abs/traction control is both off and can't ever come on, I checked the fuses and its not those, they have been off since I've had the car, so I don't know what it is. Maybe a sensor? Oh and david how was the aluminum bushings? They ever squeek or anything?