Thanks for posting this lynca. This confirms our K'Nex mockup's tendencies to auto-straighten the rear omni's after the front wheels crest the top. There was one instance where it didn't auto-straighten, but it looks like that was because the whole robot bounced a bit.
I'd recommend adding some weight to the setup, either via a small chield (j/k
), weight room weights, or some other means. It'll be a whole different animal to control when there's mass preventing it from climing and/or assisting it down the other side.