As for wobbling...give it time. I spent a long summer on a Rans (medium base) Tailwind. It's a new biomechanical position for which there is a learning curve to hit efficiency. Took me a while to get a decent spin and strengthen a few new muscles. Also took patience to slowly, really slowly, spin up hills....but the descent on the other side was bugs-in-your-teeth worth it.

Have to admit, cleaning the chain took a little longer.