I own a pair of USI's SPX skis with 6" Shapers and I love them except in hard packed snow, where I really found out good these ski hook. Anyway I talked to Rick at USI and he went through things to help on the steering effort. They say to measure 4.5 inches from the rear of the carbide and bend it up about a .5 inch. Next take a 9/16 box end and straighten up the 5th stud. The plastic will contour with the runner. By doing this you take away the rear keel in the hard pack, but it is still there when you go soft. They say the Shaper is just that aggressive, not so much the ski. If that does'nt soot you go to 6" round bars for even less steering effort. They say the '05 Revs are the worst cause Doo really put the weight on the skis this year. Don't be afraid to call these guys, they are more than willing to help. Their number is 765-423-2984 ask for Rick or Pete.