I've tried gamma pro spin 58 and 62- can't keep it in the court and can't hit out. Prince top spin - same tension range, same results. willson poly - same tension range about the same. I've used harder strings in the past such as pro blend and another hybrid string but I haven't tried this in this racquet because I don't want to hurt the touch and feel. Maybe the kps is beyond my skill level I don't know. Suggestions?