So, I have to announce that all the issues are solved now.
The problem with the bouncing was due to old firmware. The one which came with the board was 3.01. Somehow, that was interfering with the settings and doing all these strange things.
At the moment, I am able to do what I wanted. As I said before, the board and RRF are very well made and very complex. I reckon that the adventure with RRF and duet is begun.