gearing has alot to do with rider wieght, how strong of a motor (stroker, stock, play port , race port, etc.), how many paddles or size tire, How light of bike (drag or stock frame), how long of swingarm, and what your runnin on for a track!
Your current gear sounds pretty low to me. Unless you wiegh 400 lbs and run 12 paddle taller haulers with stock swingarm!