You should definatley try to make your own bait recipes. I'm having some success with one using cornmeal and Bisquick mixed with egg and milk made in to a dough. Remember cap are intelligent fish and you need to do something different to other anglers.
Also I have been using creamed corn, mixed with peanut butter, Instant Grits, garlic, strawberry jelly and instant mashed potato made in to dough.
There is more info on carp fishing bait on this site.