I'm running a 96 Ultra 680 (single-pipe) with an almond square primary spring and a silver/blue secondary spring in position #2. Any recommendations on what I can do to get more performance from this sled? (Without adding triple pipes.) I've been talking to one guy and he said to change the gears to one size smaller but I don't want to lose top end. Is there anything I can do with a differnet helix, or ? Right now it's engaging around 4200-4400...should I try a heavier spring to get the engagement higher?

Thanks.