We purchased a Cannondale tandem this spring and are enjoying it immensely. We ride in a hilly area here in southern PA and I have wondered if changing my (captain's) crank arm length would make a noticeable difference when climbing. It's difficult to figure out the tradeoffs between leverage and longer range of motion and integrate this with my longer/stronger legs vs. my stoker's shorter/less strong legs. How does it all work out? I'd be interested in any experienced tandemer opinions.