2003 GT convertible with SR progressive lowering springs, Koni progressive shocks , frame connectors, strut tower bar, camber/ castor plates and 18 inch wheels and tires. I find the ride too stiff/solid. I am considering switching to coil overs and going back to 17 inch wheels and tires. What is your opinion re: the change? Are coil overs the answer? If so, what company would you recommend?