I just bought a 4inch diam. by 8ft peice of aluminum duct.when i formed it it was to much for my coil.it gave much morer powerful arcs but no streamers even with a breakout point.can any body recommend anything to do with it?should i cut it to a smaller size?or should i take it back?the specs are---secondary--3by15,690 turns24awg.the primary---11 turns flat,copper tubing.transformer is a 9kv30ma. matt