I've been learning too, your in a similar place to me, but i am using a spinner.

I'm just about to test run my 24v wheel chair motors running on 36v, because i felt that mine was too slow also.
If they burn out with 250kilos on top i have a plan.

I found someone who will Rewind them as 36v motors so i can get a little more out of them and keep the original gearbox and mounts then my spares remain useable !

I'm using a completely different speed controller to anything i've seen on the FRA forum, it took under 1 minute to plug in to my DX6I and have it set up exactly as i wanted. Test drive went well, and its so controllable !