Smooth and consistent is the key mate. Not erratic..ideally like a metronome..constantly going at the same speed. Go and watch the operator 2 hrs later and the machine is moving exactly like it was 2 hrs previously..just like an old timer on a hand shovel he doesn't start flat out at 7am and burn out at 8am..he will just plod on all day long..and by feck he will have moved some amount compared to a handful of teenager new starters..