Originally Posted by simonk
Could you post a video of the problem? It probably has nothing to do with the oscillator unless it's just jerky because you're right on the edge of on/off at 10%. If 9% stops it and 11% is fine, then that's all it is; otherwise, it probably has to do with the FET switch timing, which newer code might improve, but that would be strange.
Here is the video
Please ignore the noise. Its not from the motor but from the wooden base i attached it to