If you relax your string hand except for the fingers that are holding the string, it is impossible for your wrists to break in and your fingers to go out. A relaxed string hand pulls in line with the force of the string, and doesn't torque or cup. The feeling you should get as you start to draw the bow is that the pulling force is the muscle behind your shoulder blade, and your forearm is just a linked chain connecting your elbow and your string fingers.
My feeling, and I have the impression that Arne may be feeling the same way, is that you may be overthinking things at this point in your archery progress. Learning traditional archery involves shooting a lot of arrows, and letting your body learn things experientially, non-verbally, based on what feels right and what feels wrong.
It has to be a balance. Some people go too far in the other direction, and never ask questions or take lessons that could speed their progress.