I think most of the things that we fish for carp with are scent oriented materials. You aren't going to get much scent out of a fly, but it is something that you may want to experiment with. I seems to me that I read a posting in here one time and someone was trying tunafish can oil and something else. How about WD-40, the old walleye fisherman standby? As far as flys, I am thinking of trying stone flies, hellgramites, dragonfly nymphs and such. I'm thinking big-nymph in heavy current. Maybe even weight line and/or leader. Going to make time this summer to go and try some carp flyfishing. The Mississippi is full of them right in the headwaters of the dam. Good luck with this and keep me posted as to how you are doing.