slowboat, this does not make sense...
You write it breaches (ventilates meaning wing getting too high) if you dont push with your rear foot?
This is not what happens, more likely that you dont turn much and the foil continues to tilt over till you crash...
But apart from that, it is very true what you write, and how it is.
Going straight, some foils more than others, need more front pressure when going faster or down a wave, others are almost neutral - simply foil specific and trim specific differences.
And when turning, you need to push harder and harder with the rear foot, the more narrow you want to turn, this is how it is.
Can be compared to when you fly a glider, if you bank the glider (ailerons or rudder) and doing nothing else, it will either almost not turn at all, or turn a bit only, but in both situations (again, trim dependant) it will drop fast into a (death)spiral instead of turning
So for the wing to keep its lift during this acceleration (changing direction IS an acceleration), you pull the elevator.
In narrow turns you pull HARD on the elevator.
As a hydrofoil dont have an elevator, because the stabilizer is at a fixed angle, we have to push hard with our rear foot to get narrow turns, so it is like it should be slowboat
We control the "lacking" elevator for pitch control, with our weight distribution instead.
And carving around hard and narrow, we need to push with the rear foot.
This is why I like a really wide stance, and rear foot as far behind the mast as possible, I find this gives me the best control and feel.
BUT, this is only me, as I know, and can, stand with a very narrow stance and carve just as hard, so simply a matter of what feels best for you.