Do you have the prog. card? Honestly IMO Hobbywing ESC's are cogg free when paired with a decent motor. And not too bad with a budget motor. You might need to turn up the punch or timming. Sometime you need to play around with the settings to find that right spot. You also could recaliberate your radio. That needs done again once in ahwile.
Also make shure your ESC isnt right next to your radio.