Thanks for tips Borist and BWD. In 2nd session, I can hold it down and ride for extended lengths on foil. But it's precarious, twitchy, will drop down as soon as weight not centred right. I will have to give it a 3rd try at least, and this time while fresh ... at the 2.5 hour point of this marathon session, my legs (quads) had nothing left, pretty much physically unable to make it work at end. So, unsure if it was the foil not working, me not working, or probably the combo.
First thing I'm going to try is removing the 1" spacer on front wing, see if that has any effect.
For shortening fuselage, I can try the normal mast bolts, which would shorten it by about 2.5-3"....will experiment with that too.