Hey excav8ter, I'm with you on not having anyone to practice with. Well, there is one guy, but he can't join me that often at my local windfoiling spots in the Columbia Basin of eastern Washington state.
Fortunately, I can get down to the far eastern gorge spots (Roosevelt, 3-Mile, Arlington) in 75 minutes. There you do start to see other windsurfers and kiters, but not too many foilers yet. (But we're working on that.) Many many many foilers down further west in the gorge.
I actually think a bit of speed (such as 20 mph boat speed) is a good thing for foiling. Like many things in windsurfing, too, speed stabilizes things. As such, my wings of 779 cm2, 940 cm2, and 1120 cm2 are plenty for easy lift. I weigh 90 kg. Even the 1120 will stall the mast at really low speed if I try to milk it in really light wind. It is better to use a bigger sail and get everything going a little faster on the water. My go-to sizes are 6.4 and 7.0, sometimes a 5.0.
That said, the i76 is very popular around the Pacific NW. Even gorge guys in strong winds like the i76 with really small sails--down to 2.6 on those big days.
Notice I say "guys." I have yet to see any women windfoilers, even in the Gorge.
So, excav8ter, if you are coming out to the gorge, stop by here on your way, and I will show you some nice windfoiling spots. This youtube shows my favorite spot.