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IWB said..
I windsurf foiled my JP Australia 7' once about 6 months ago (need to get out again) and think i had the NP foil L, mid way to slightly back of midway. I was using the standard NP surf fuselage. Are you using the surf fuselage or the windsurf fuselage on your NP foil? My preference on the foil position is to have sufficient amount of front foot pressure.
When sup foiling my JP7,0 I have the foil 3/4 forward (rear right screw over decal line) and have plenty of lift and allow my feet to be aligned nicely over the footstrap area (riding strapless). I have been using the Starboard Ocean 2000 foil which is a slightly bigger more high aspect wing (super stable). Im still at the early stage with 6 or 7 sup foiling sessions under the belt. Pumping the foil and feeling the board glide along after the wave has gone is a blast. Cant wait for the next session.
I have the JP 7' as well and the Naish Foil system. For SUP foiling I'm like you and like the foil 3/4 of the way forward or a 1/4 of the way back. I've windsurfed the board with the SUP fuselage in the same position and it gets a little squirrley when pumping up on a plane...which makes sense as the position is approaching that of a keel vs a rudder. Other than that...once up its very loose and fun.
I get better performance though by using the Naish windsurf fuselage as it places the front wing 4-5 inches forward, which allows me to move the mast back to mid-point or 3/4 of the way back. The result is easier pumping the board up on a straight line w just a little loss of looseness.
It really hit me a few months ago when I left the SUP fuselage in and moved the mast back to windsurf position...I wasn't coming up as easy and it was harder to pump on a straight line without going in a circle. ;0 Switched to the windsurf fuselage and boom....up right away and pumping line was better. All these positions work great for the foot against the kick pad position.
My more advanced position is the mast 3/4 forward with windsurf fuselage. I'll use this when it's not a bottom end day and I'm really focusing on just riding chop and little swells. Then my front foot is right behind the mast base, rear foot 4-6 inches forward of kickpad and upright surfing stance.
Hope all this helps.