Well I kept the same gearing because it felt spot on even after I added another cell, I'll have to find some way of figuring out what final ratio I should end up at on a Rusty running an mgm80, Lehner 4200 and 9 cells.
Currently I'm at 20 teeth but I threw on a 21 tooth tonight because it felt really torquey still.
It keeps the front end on the ground so it's not rediculously low but at the same time it'll just spin the tires for as long as you hold the throttle if you punch it (with the correct tires for different applications).
I'll look into it.