Instead of chasing that elusive "sweet spot" in the performance envelope with all sorts of creative gear changes, why not just build some more torque into the engine, and/or flatten the torque curve where a few RPM's difference doesn't really matter? The old NASCAR adage applies here- - - -"Horsepower is to brag about- - - -torque wins races!"
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!