Sprockets are cheap as hell and easy to change out! get a good selection and try out different ones. I think right now i have 14/44 or 13/44. if you aren't using your 4th and 5th gear on the hill shoots then you need to loose a tooth up front (making it lower geared might make your front end come up easier but give it a try, I like to lean forward and spin hard off the line then move my weight back as I gain momentum to increase traction). your front sprockets make pretty drastic changes, however your back are minor changes. get close with your front then go up or down with the back.