Thanks for your comments, I am blushing

and transmitting the feedback to Patrice Guenole...
ghost4man, yep, wide tail and fast rocker make take off incredibly efficient, but it is all in the timing. With a longer board you can just blindly paddle until the board takes off. With a short board you have to time your second paddle stroke just when the "bump" of the wave hits your rear foot, and use a lot of body english. If you do it at the right time, take off is surprisingly efficient. The trick is to practice in very small & weak waves, trying to take off in 2 strokes.
Of course on powerful waves, things can get hairy, be prepared for an "aircraft carrier" launch :-) Too bad I had only one good day (2', with SurfingJ) but I tried other boards I wanted to test in these conditions. I am eager to try the mini Simmons in good waves too.
Tang: XTR is the name of the construction (brushed carbon, PVC sandwich deck). The model is called "AS" for Alaia / Simmons, as these shapes can be also be used finless, but this is too hard for my abilities...
Greystoke: yes, that's why quivers are for: to have wildly different styles of boards!