225/45 is a good size that's close to the factory tire diameter, but at that tire width you really need wider wheels to avoid sidewall flex. Almost 9" of tire width on a 6.5" wide wheel isn't good for tight handling. I'd look at some better handling tires in the stock size, like the Bridgestone Potenza S-04 for Summer tires or the Continental ExtremeContact DWS for all-seasons. The stock Hankooks are designed for a long-wearing smooth ride in all conditions at a low price rather than great handling.