Works pretty good... for a knock off.
I was about to ask if your diffs were locked for why the trans skipped, but it looks like the rear axle is open atleast. I tried some Shoo Goo in your red GL in just the last axle for limited slip diff, it improved its traction without causing the steer tires to skid, but it will peel the floats off with the trk loaded & BB's didn't help to keep them on either.
Still got your mig? Need a bigger bucket. 20 guage wouldn't be overly heavy.
You need a better esc for for/rev, ever try Servonaut's S20? I used one for my 850's swing motor, speeds up evenly/smoothly - slows down the same way. They're pricy, but it's the best I've ever tried & quite compact too.