Hi all, I finally finished my conversion! After lots of shopping around and delay, I’ve finally built it. I do have one major issue though, which is what I’m here to ask about. When I use an assist setting greater than 3 or push the throttle any more than a tiny amount while below 25 km/h, the bike will pull for a second and then it sounds like the motor and controller de-sync, with the controller running through the phases faster than the motor is spinning. The motor is a q100 cst, the controller is an S09 square wave sensorless torque simulation controller, limited by the LCD to 18 amps, powered by a 48v 7.2 Ah battery. I have noticed that problem sometimes manifests on assist level 3 if the bike does not accelerate quickly enough, for example if going up a hill or into a strong headwind. It seems to happen near the end of the time it takes for the “soft start” function to finish, so I wonder if that is the problem. Any help would be greatly appreciated. I have uploaded a video of the problem to YouTube here. Sorry for the shaky handlebars, starting from zero with only one hand is a bit unstable.