Different pennants for different head sails, I guess I was having a Homer Simpson moment, “Doh!”.
This seams to be the obvious solution, As long as get the head sail height correct, which, at the moment, seems to be almost all the way up.
My point about the foot of the head sail being lower then the boom is that it also makes it lower then the foot of the main. I’m not sure how much overlap the foot (foots, feet??) of both sails should have. It seems to me that there is little advantage in having the genny overlap the main, more turbulence in the air flow on the genny which should cause less lift (pull, fource). My expertise does not extend to fluid dynamics but I do know some basics, hence the question.