Nice wipe out to end the vid!
I guess with 1st being geared so low, that might help it avoid stripping the 1st gear spur due to flexing the crank shaft under load. Seeing that long of a bell just screams fried bearings and spurs to me.
As for the brakes, looks like you might have enough room to add another pad and a disc to help.
I didn't realize how exposed the steering linkage is on that thing. Have to be careful going over things that you high center on.