Dui said:I can tell you for sure that this is not a controller issue (unless you got a defective one, but I really doubt it). Sabvoton controllers are really good at managing slow speed since they do current vectoring control, not speed control.
So either your issue comes from the throttle itself, or, more likely, a wrong setup of some parameters in the controller interface.
The controller used before only has a case which looks similar to Sabvoton, but it is from Powervelocity (Infineon based) with speed based throttle which sucks in every way for vehicles as powerful as this one.