I finally fit the FS-70 surpass (with 13x7 APC) and it flies like a charm. A/C don't fly very vary fast but it pulls more than the OS- 55ax, I can nearly make unlimited verticals !
After little practice kiss landing can be made at each try if approach slope is not too high and a (very) little throttle is kept.
I'm very satisfied with this setup much more than with the 55ax; I don't understand why they recommend a .46 on the box…. Nevertheless I will try a 14x6 propeller as I spin the 13x7 at about 10k Rpm.