Yeah, Diablo was 2WD with the wheels in the centre, although I don't think it was set up like that until after the champs when Dave bought it.

Drumroll ran with a wedge at this year's champs, yes. For the most part, I found it to be very beneficial and helped to feed the robots up into the drum. All worked well until I fought Galactus and he got a head-on smash on the wedge and bent it up into the drum, jamming it.

I won't be remaking the wedge though, mainly because I'll be fabricating a new drum with a slightly larger diameter to take the teeth closer to the floor (something I couldn't do with the current drum without butchering the chassis). However I still like the wedge and might re-adopt it for a whiteboard spinner machine.