I have a brand new MM pro, running a 1900kv Tekin T8. I ran it a couple times and it felt like it was simply way undergeared. Good accelleration, topped off early. Well, depending on how I rolled into the throttle it changed drastically. If I slowly rolled on, it would more than double the power and top speed.

RC8BE 19/46

Just took it out of the box, so whatever firmware it shipped with is what I am running.

Also note, when it runs at full power forward, then my brakes are cut in half.......when its slow in forward, my brakes are ultra strong.