Help choosing the right board for foil

Hi,
I hope you guys can help me decide which board too make my first foilboard :-)
I have a JP widebode 9'3" x 32" and a JP Slate 7'6" x 29"
I think I am going to order a Naish foil with the big wing. I am 190 lps.
It will manly be used for dw on a big lake/fjord where it very windy. it will also be used in the ocean where we have wind swell the most of the time.
I can see most people choose small boards for foil, but I am afraid it will be to small for me, because I only use the small in good condition. The big one I am thinking it is maybe to wide.
Hope you can help me pick the right board ??

There is no question that a proficient foiler would prefer the 7'6".

However, the question is during the learning phase. If you can now take off normally on the intended waves with the 7'6" without a foil, use it. Otherwise be wary that the foil actually makes the board less stable (the foil adds its own stability that acts differently as the stability of the board - they can both pull in a different direction at times - , the result is quite confusing during the learning phases). And you must be competent enough to already totally master the row effect on the 7'6".

The reason I advise to be cautious is that I have a friend without enough SUPing experience try foiling on a board too short for his SUPing abilities (8'3" for 75kg in his case... he was SUPing 9' boards), and reselling everything, disgusted, and getting bitter. If you do not feel like being able to paddle hard on the 7'6" without changing sides, be prepared to either boost your SUPing technique before foiling, or spend time behind a boat, or maybe keep the rear fins for learning to foil.

Hi Piros,

Would it be worth converting a 7'2" BAM (One of the Sup's I already have)? I'm 90kgs and surf both the 7'2 and a 9'. But find i'm mostly on the 9' as the 7'2' is awesome on the wave, but such a slow pig to paddle back out and you really have to pick the days where the wave frequency gap is enough to get out or else it's just one hard slog, compared to the 9' were you are back out before the sets come back in.
Or do you think a 8' board might be a better compromise in being able to get out and fast enough to paddle onto swell.
Keen to seek opinions of people who have tried before spending $$$ on convert a boards that don't suit.
P.S Have been Kite surfing foils for about a year and have a good handle on the kite foiling side, but keen to extend into SUP to cover the windless days.

Thanks

Thanks guys
I Think I will go for the 7'6" then.
And see if I get someone to take me out on a boat.
And then just practice a lot
would it help to practice with a kite also? I do kite to.

I am doing a lot of wind foiling and really getting into that weightless sensation and curious about SUP foiling now. I have Minion 7'4 x 27.75" 104L which could be a good shape to covert to a foil board but is too small for me at 83kg and a handy SUP surfer?

I struggle in the chop on the Minion so would a foil make things harder? Should I look for a wider board with 120L+ in volume for stability as a foil board? I have a Sunova Acid 8'10 @120L as my go to surf SUP - maybe I could convert that?

I am able to get a good deal on the NSP DC surf SUPS and the Surf Wide 8'3 x 32" @138L might be a better shape for foiling?

What Colas said. Use the shortest board that you're comfortable with. It's easy to go longer but there's negatives as well.