tried all your shims, but there is not enough information to give a 100% correct answer as the very often used wording "to much front foot pressure" is not a precise diagnosis, but more an impression, but most likely it is not connected to shimming (1.-2.) but to relative foot placement to foil placement or in the beginning when not yet being used to normal board speeds, so riding to slow.
a) So if the real diagnosis is that you just have more body weight on the front foot as the pressure point of the foil is closer to it, it is easy to see, that you just have to move foot position towards front or foil connection towards back, which is the same.
b)/"1." If you can't do that, another solution would be to pitch up the whole foil at the fuse to strut connection even if this is the most sensible place for static reasons, so you should be sure to do it well, 1,5 - 2° as step should mostly be enough and well to feel.
c)/"3." But the solution I normaly would prefer is to decrease the negative pitch of the stabi and therefore also its drag, but as you said this can also decrease foils pitch stability, but as we know from monofoiling this is more an idea in our heads ...
And as said there are also bad trimm situations feeling like front foot pressure, but in fact are more connected to bad board angle to foil "2." (when one leg is always bend), which then could more likely solved by pitching between board and foil. But on the end as seen, after the ideal solution, there is always more then one way especially as 80% of the foils I test aren't setuped and balanced well anyway. But it is also about riders weight and your prefered riding speed, which can also be setuped by foil trimming.