Hi all, The story goes like this... Two months ago I sold both my K95s and bought a K90. I loved how much more control i was getting and I was just crushing the ball- hitting more top spin than ever. I switched to hybird strings and i got even more feel. I was glad that i made the switch. Then about a month ago i bought a KPS88- i figured that even if the racket didn't fit me or if i wasn't strong enough to use it that it would just go in my wilson obsession's collection. The next day i brought it the courts with me and tried it out. To be honest at first it felt almost "the same" as the K90...but as i went on into the second and third hour with it i was getting more topspin and especially FEEL that i had never experienced before. I could really feel the balls POPing off the strings. It was great. On day two when i went back to the K90 i was just getting warmed up when I tried to hit a top spin winner and the strings broke. Thankfully I had my KPS88. It became my main stick for about 3 days while the K90 was getting restrung. When I tried going back to the K90...I couldn't?! I couldn't rallley or hit topspin or anything. I doubted myself like maybe i was just having a bad tennis day. Then i picked up the KPS88 and i was back! topspin, forehand, backhand, slices, serves, etc. Now everyday i try the K90 for about 10 minutes till i just can't stand it anymore. I go back to the KPS88. The swinging feels all wrong on the K90. What is the problem here? the Head Light factor? should i add lead tape to the K90? conclusion-can't hit with K90 and can only hit with KPS88.