I'm fairly happy with how my machine runs. Speed seems about right for what it is.
My 1/16 scale 1940s machine is a bit out-classed by higher yardage, modern, and larger scale trucks. Yes, that's why you try to match the Hauler to Loaders and the planned routes. A couple of the excavators could fill it in 6 scoops. There was a wheel loader that could fill it to struck in 2 scoops. It's not a Grand Hauler with an end-dump, or a Mack M-series. Different roles.
I learned that the Dump worked great in crumb rubber. Servo had enough power to keep the doors closed.
100% open drops the bed within a few seconds. Box cleans itself well.
50% open drops it a little slower, and leaves a bit in the corners.
Accidently driving off with 50% dump spreads a really nice furrow.
Steering is still really touchy. But i was able to hand off the TX to a friend, and they got used to the driving style pretty quick too.
I do need to upgrade Escs. There seems to be some brown out, and they don't seem happy with the back emf of motors going locked rotor.