I have an 03 pro x i9t has slp twin pipes ans cheater head with required jets installed. wide ope, this runs great, super fast. after cruising a while tho it seems to load up and be sluggish on throttle. It also seems to use a redicualous amount of gas compaired to my stock 800 driving the same speed, cruising or full throttle? any ideas on why so much fuel and sluggish cruise?