Your really close...
First, the main shaft seems resistive. Consider just that shaft with nothing else on the
board, if you flick it, it should spin several times before stopping, I see too much friction
on yours as it stops within a half spin or so, shoot for 5 full spinds from a simple flick
of the finger on that shaft.
Second, make sure if you rotate it very slowly to the trigger point that the impulse
pallet is struck just at the right spot to give you maximum thrust. I cantr see in the video
if this is true or not so Ill mention it, but from what i see you may..only may.. be hitting it a
bit early so not as much energy is transfered as you might otherwise get.
Your primary problem though is that the main shaft should spin much much more freely than you
have. Watch my video and see how freely that main shaft spins.
All that having been said, you are indeed very very close, only a tweak or so away from
your eureka moment and a happy face.
Art