There is no definitive answer because it depends on rider, board, and wind. I would just put it in the middle. Then don't use foot straps. That way you can move your feet around once you're up on foil. On windy days or if you're going down wabes, put a back a little further.

DavidJohn and Jake, thank you for your answers! John, at the moment is my sweet spot ca. 3-3,5 cm from the front of the box, depending on the wind. I have a S26 110l board. I think that fits to your position on a 125l board. I have the most problems in small choppy conditions to come up. I need more time on the water. Nice MA foil! Nice vid! Which stab do you use? 280? 310? is MA 1200 big enough for "our" weight?

Kane deWilde's method in Robert's video (blue planet surf) @11.52 is a good place to start
and Damien explains well the issue of early lifting and having trouble pumping up depending on mast position

wingDingRui said..
Thank you very much. I'll keep on trying.

DavidJohn: "More time on the water is the answer.. and trying not to use those old windsurfing techniques because it's so different..'

what do you mean other than too much back foot pressure?

Hi
ive recently moved on to a HA1400 with a 95 hover. Out of interest my mast is middleish.

I know what you mean about getting up on foil in chop. You need board speed and to keep the board more level when getting on foil. when I go out in heavy sea/chop I find I breach a lot as do not have enough board speed and using too much back foot pressure. I really focus on front foot pressure and rise out of the water gradually.
I am ex windsurfer and it takes a lot to change technique, I first started riding it like a windsurfer but now ride over the foil and a more central, balanced stance. 100% better. experiment, time on the water, it will happen.

Hi rgmacca, thx
I read your posts on choppy conditions and felt the same.
one big problem is coming up in chopped conditions (strong wind chops) because chops slows you down.
Foil more in front helps but
when I'm up on foil it's hard not to overfoil because of to much speed I. Strong wind.
I think the solution for strong wind is -> foil back in US track and better "come on foil" technique