Have you efoiled it or are you pumping the wing?
I am wingfoiling it.
I have a sirus 116cm, no problem to ride with ALU gong V2 mast 75cm, very nice setup to learn pumping and surf very small waves with a faux drive 
Some picture in 20 cm swell (taken by a webcam) :
(I have an efoil with gong V1, glued it also between baseplate and mast, but still some flex, not great, I plan to transfer my efoil setup to a gong V2 75 cm alu mast)
75 cm v2 seems to work. I tried my sirus 156 on a 95cm v2 and it was unridable
I can’t lie, I’d be very interested to see how the sirus 156cm feels with an assist setup. Must be super easy to get up and cruise…
sirus 116 and 67 kg with an assit setup is really great.
I can pump for 20-30 pumps after 3 sessions, and surf foil small waves (20-30cm)
Not sure but sirus 156cm seems too big to enjoy the turn and some carving for a foil assist surf session. (may be a good solution to learn pumping on flat water, but you need a HM mast and titan fuselage, very expensive for this use, not needed with sirus 116)
I have mounted an assist. 63100 motor on 8s 3p 21700., xCross 160A.
Was on the water only 1 time, and it already was too cold here.
But it came on wing super easy. And the feeling with the HM Carbon mast was soo much better than with the v2 Alu.
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