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This is the best I can do at short notice:

Yes I have had problems with the trike pitching and the foil stalling, usually though due to too much throttle power, the foil needing to move forward rather than pitch back and if use put too much throttle the foil stalls. This morning I shortened the leading edge lines another 3cm shorter than on the photo but this caused the foil's leading edge to tuck unnervingly & repeatedly down in the glide, I might try to shorten them another 1cm or so and try that and do it until I get that leading edge fold-under and back off a cm or so.

I lengthened both (left and right), the very far outer trailing edge string by about 2cm (1") as test flights showed that those caused the outer trailing edges to pull in almost like wash-in on a wing, not sure if that's helped but it seems so.

I'm still seeing a crease just forward of the steering lines which I might try shortening the strings ahead slightly.

I also get left/right swinging quite a bit which I understand the full size ones do as well but one can counter-act the swing with opposite "aileron" at the right time.