Nobody ? Well, I reply to myself, although I don't give a solution, but some further observations.
Today I have used the rege controller on my usual way instead of the broken standard controller.
I really can't find its interest :
The braking was so strong that I had to use throttle even in the places where I usually only pedal ; When releasing it, I went down a 15% street at less than 15 km/h, and it totally stopped me when running down a the smoother hill.
My average speed for 13 km has decreased from 24 to 20 km/h, whereas my consumption has increased by 10%. Because I had to maintain the throttle engaged, my thumb was aching...
I would like to buy a new standard controller, but Mr Yao DOES NOT REPLY anymore. Very frustating. Since it is not easy to find a Goldenmotor controller elsewhere, do you think I can use a Crystalyte one for instance ?