Lots of fooling around getting that gear train right eh?
I never needed the flywheel because I can program the ramp up on the motor with the settings on my motor drive boards. They can be set from 0-20sec. to ramp up to full rpm then down, "regen to stop" or, "coast to stop" Without, you get a big pendulum swinging back and forth
I also have my radio sticks set up on a curve to ramp up. I may try the flywheel someday just to see how that would work.