Hi Marc - I have the Cafe, and the amount of assist provided in the levels is not directly editable by the rider. However, I was able to work with the service guys at Vintage when I installed a new controller a year into riding; it came with the 5 levels of assist all pre-programmed to give more assist, earlier, than the controller I had before -- Level 1 on the new controller was now like the output of the old Level 2... too much assist for me in Level 1
They were able to "retune" the programming so that the levels of assist reverted to a lower starting point as before, so I too would get in some exercise on rides. I'd give 'em a call and explain you want to explore a retune of the assist output levels.