If you are using the Clark board (or any other for that matter) you can do what I do on my tanks. Limit the end points on your Tx to make your own top speed. Then apply some expo to make your stick very soft in the middle (on your Tx) and your tank will creep away. I had my Leo2 at Danville and even with 390 motors it was still a GREAT creeper. I do the same for all my tanks. The only problem with that and the Clark system is that you may loose a bit of top end motor sound if you limit the end points. I'm sure there is a way around this, I'm not the Clark guru