Hi, My current racket of choice is the AeroPro Drive Cortex (Non-GT). I tried the GT for 6 months but the stiffness felt higher and swingweight was higher. My question is the new AeroPro Drive 2013 similar to the Cortex (Non-GT) version as the swingweight is now lower? Is it worth the upgrade? If not, I will search for used cortex (non-gt) racquets. Thanks!