Thanks for the swift reply Rik, clearance didn't seem to be the problem as i sprayed the riser with dry shampoo and the arrow didn't leave any contact marks that we could see. Plus it left my riser smelling nice �� �� . Strangely enough i had a similar problem with flonite vanes a few years ago. The arrows didn't miss the target but two kept landing in the black and the others hit the gold. I just assumed that stiffer plastic vanes seem to be far less forgiving than thin foil ones. Anyway thanks for your input and happy shooting. Or as they say here in Germany "Alles ins Gold".