Hi! I’ve been having this problem for a long time. Not sure if I’m able to describe it correctly.
Say, I play a scale starting on 6th string and ending on 1st one. As I go from string to string, I either have to change angle of the wrist regarding to elbow, or change the position of the hand moving it lower as I move across strings. Both options feel kinda awkward for me, but when I don’t think about it, hand stays in its original position, and pick ends up picking high strings at a very different angle. I recall this topic is covered somewhere, but can’t remember where exactly. Would someone point me?