I am still riding 5"10 x 27 110l
most crew seam to be riding longer and narrower boards.
what are you on
surfing not down wind
Armstrong 8ft 11in x 17.25 x 108l mostly.
However, I have JL 8ft 5in Striker for regular SUP
My current surf SUP foil board is a 7'8 x 22 x 135L downwind style board. Prior to that I was on a 5'8 x 27 x 110L board for a few years. The 7'8 is a wave magnet and great for covering distance but is really a little long for the surf and is hard work in any chop. Something around 6'8 x 25 x 125L would be sweet. I like to run with a front foot strap as well. I weigh 88kg for reference.
Naish crossover. Love it but looking for something a bit narrower. Tried a downwind @ 7 6 x 20 but just too tippy in open ocean for me. I'd like something 7 ish x 24. eventually 
For the lake at 85kg I'm still loving my KT Dragonfly V1 7' 19" 100L with AFS Enduro 1300/43 for tiny lake wave surfing. It is super tippy and definitely too small for me but learnt to SUP foil on it. It was my light wind wing board and now Parawing board so I've been really able to spend a ton of time building my balance skills on it and has payed off. When I do eventually get a new board think I'll go the same dimensions again.
My conditions for SUP foil:
Select to expand quotefoilthegreats said..
For the lake at 85kg I'm still loving my KT Dragonfly V1 7' 19" 100L with AFS Enduro 1300/43 for tiny lake wave surfing. It is super tippy and definitely too small for me but learnt to SUP foil on it. It was my light wind wing board and now Parawing board so I've been really able to spend a ton of time building my balance skills on it and has payed off. When I do eventually get a new board think I'll go the same dimensions again.
My conditions for SUP foil:
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Great skills!!!
8'6 x 22 , 135L Jimmy Lewis Twisted Vee catches just about anything I want.
Thinking about getting a custom Jimmy lewis in the 7' - 7'4 range by about 24.
Also have the Naish DW 125 L , 7'4 x 25, great board too.
I've been testing a lot of different dims/shapes for SUP surf foil from full blown downwind shapes to short and stubbier shapes.
My main current board is a Duotone Downwinder 6'10 x 20 @95L but suspect my next board will be something along the lines of the Armstrong ML85 6'5 x 20 3/4 @85L
Yes you lose some initial paddle speed as the boards get shorter but I still get HEAPS of waves (lets say 20-30/h)
The increase in performance is undeniable mostly in the radius of turns and a fair bit easier pump which is why I'll continue to search for the tipping point of how much paddle speed I'm willing to give up vs how well it surfs.
KT Surf 2, 7'6" 112L is my board this year for SUP with lighter wind parawinging. It's narrower than my previous Dragonfly 2 110L and feels a fair bit sportier in the air, but in some ways I prefer 20" for extra leverage in turning. I'm tall and 93kg so the narrower shapes can feel like I'm a bit cuffed at the ankles with regard to offset stance in SUP but I'm adapting. Winging it feels fine. I miss the shorter length of my old Armstrong SUP at 5.11, but don't miss the sluggish paddling or catching rails.
5'6 x 20'5 (85l) and a 5'8 x 21" (90l) both home builds. Then if it's big or there's a long paddle or lots of current (river mouth surf etc) I'll grab my 7' x 19" DW SUP
Still riding my Takoon Escape 8'0" (V1). It's 21"wide and 120 litres. Enough stability for SUP foiling in our shallow, coastal area with wind generated swells, upto 12 knots (above the chop and currents become to anoying and I can use that set-up from 8 knots up with a 5m wing).
Use the board for winging a lot as well. Allows for relatively small wing or foil and gives confidence for a long paddle in if the wind dies (or equipment fails (at 1 km from the beach)).
Biggest downsides are board weight and the stretched outline makes the rails bite in touch downs, straightening it's course.
If I would only be SUP foiling, I would go down to 7' and 24" wide at 120 litre with a DW-inspired bottom. Bit better acceleration and floating stability and less lenght to pump and turn.
