Andy, did you get this resolved? I got in touch with him yesterday and he said he will be sending out replacement upgraded controllers which have much smoother output. We shall see. I will update this thread if I receive the kit.

I have been looking at the AXBB-E controller with closed-loop servos. Obviously, in hindsight this is the right gear for the job but it is my fault for not putting enough research into this. I just have to make the most of the situation and get it sorted as best I can.