What throttle are you planning on using?
I am about to get a Recumpence-throttle in the mail. I have parts for several different affordable throttle options, but I want to start with a proven throttle system so I'll know that any problems that arise are from somewhere else.
Based on the experiences of Kepler and others, I have started my RC-work with the 63mm motors. edit: nothing wrong with the 50mm motors, several are getting good results and also identifying the proper combinations and operating parameters to make them a useful choice. I just wanted to have more mass as a safety margin while I am stumbling towards my end goals.
If the entire drive gets sorted out, I will begin swapping in equipment options one at a time to see how each affects the overall performance. I want to identify weak links, and then find the dividing line, so I can record some data with a reasonable amount of accuracy. Some builders want to run right on the ragged edge, and others want to know where the edge is, so they can stay a few feet back (even if it costs a few dollars more)...