Righto last four days or so been playing around with all these ideas at the more extreme end of sinking.
so I'm probably 78kg at moment suited up on a 34L 4'5 FG board and I'm no spring chicken at 48. So well below half of body weight to litres. Plus the length . if you had a longer board with same volume it would be easier as well to find balance point.
in the end the stink bud method on two knees worked the best for me. Aka same as vid posted by Pat WA which the guy only coincidently is on the same board.
after a few days of pain and swearing so loudly I nearly lost my voice, yesterday was a break through point in case.
I was able for the first time be on the same wing size as the best winger around these parts (Jason Aka wingman) on a 3.8 PPC, he on a 75L PPC board. Albeit he could have been on the 2.8 out back (but this guy rides stupidly small wings he's that efficient) but it was sketchy on the inside with waves running around a point into a wind shadow. But he wasn't nuked though and nor were I. Just well powered. (Wind was 18-20 ish).
The squat method just wouldn't get me up - nearly but not quite. Here is the bottom line where the game is won or lost.
Because you are so far under water on your feet in the squat - when you lift the wing to get power, you have to extend your body up to get a decent wing pump. This in turn pushes the body / legs down. Of course you mitigate this by bending the front leg as much as possible to get an acute angle of attack - but it's very easy to fall off the back this way. You are still trying to haul a lot of fat ass on a small board to the surface. Tried many times and not quite (bar one on a freak gust).
Back knee only on - lift front on when start.
Front knee only on - lift back leg when start
both these are too difficult balance wise for me on a sinker like this.
even back knee on, front foot in strap already, then start - while less unstable than above, you end up having very similar problems with the squat start - when lift wing that front foot keeps the nose down. Also it is more unstable than two knees. That being said this is the last option I will explore a bit further next session - because it would be nice to have the front foot already setup when you breach the surface.
on knees, with that acute angle - the nose is much closer to the surface and it surprisingly easy to breach the surface. When you lift body to pump the wing you are not pushing the board so far back into the water. I was able to even do it on the inside in the wind shadow - although planning up from there wasn't easy. But once up on the outside was easy enough to get going as per usual.
But the difficulty is getting that balance point on your knees (especially in the decent swell that was there) without corking either forward or backwards. Good deck grip over the entire board is recommended. But three sessions later it has already got easier. As I said earlier a longer board would help - give you a greater margin of error on the pivot point of falling forward or falling back when on two knees. Or indeed being pivoted around to the side and off board.
That being said i recon the next board size up at 39L would make life significantly easier. That is - a board at half your body weight or slightly above is realistic for using this method - anything less you are pushing Sh1te up hill and hence require a wing size that becomes very uncomfortable - especially in the rolling swell waves I've been experimenting in. Which is the true test. Anyone can piss about on nice flat water make a vid and look like a legend. This was a decent point break with rolling swells coming in from a relatively deeper drop off well out back.
anyhow hope this helps others that are experimenting with these stupidly small boards like this masochist.
Just to repost the clip PatWA put here for reference to what worked best. (Although I don't have the board at such an acute angle, nor do I piss about. Get wing up, board above surface, then I pump on knees for a bit if not enough wind.).
anyhow sorry for the essay . signing off one banged up mofo
ps thanks for all the help via messages here lads. Appreciated it.
be interesting to see how you go man. As I have said the issue I'm having is I can get up alright on my 34L but the wing I need to get up is then we'll in it's upper wind range for the wind, hence always uncomfortable - especially in waves.
so your technique just avoids bringing the wing towards you when already on your knees - which can be very unstable on a semi sinker. So I essentially now have three versions to practise. I want to see which one works best on a true sinker - which mine is below half my body weight. 
do 8k windwing on a 40l board. He was stepping down from a big 65l board.
Gotta love the stink.
