Last week we took my sons binding off his 66 A3. His binding is a radar strada. When we put it back on we accidentally forgot to put the two center screws in. His last 3 nights he has done 3 pb's at 36 mph. He has also has a few pb's for wipeouts in the process because the ski skips out from under him at the apex of the turn. Tonight we noticed that the binding has moved completely forward because of the missing center screws. He has done better with the binding forward but I don't know what to do with the fin to keep the ski from skipping out. Any ideas?