Get well soon Laurent.
I too make use of flexing thin diameter carbon fibre tubes to form the OTA.
No vibrations. No flex either in the OTA. The trick is in the strain introduced to the poles, they work against each other to provide the necessary rigidity and vibration free.
I can swap between a wee 6mm plossl to a 1kg eyepiece, and collimation holds fast
Vibrations can also be introduced from a poorly designed rocker box. Design the rocker box properly, and no vibrations, no backlash, and the quality of the action is constant and silky smooth.
I haven't gone down the segmented poles route though. I haven't found a connection system that satisfies me. I cannot comment on Laurent's design as I have no experience with his scope, obviously. I would love to hear from you, Laurent about the system you use to join the poles! It is most innovative.
Alex.