There is a good book with this title that warrants readiing. If the Carp are chasing each other vigorously, they are spawning and won't be interested in your flies. Look for the loneers that are actively feeding. The presentation is more similar to redffish than bones. If Mr. Carp has his nose in the mud, he won't be able to see your fly. If you can put the fly out in front of him, let it settlle to the bottom, and wait for him to quit stirring up mud before giving the fly a little strip. The fly must be moving away from the fish
when you strip it. Remember, "prey does not attack the preditor." Try nymphs in the 14 to 10 range and 3x tippet. And the hooks must be sharp to stick those rubber lips.