To me, the hands are an indecation of our balance. If you are in balance, the hands are where ever they need or should be (easier said than done). As a rule, the sames you mentioned are a good guideline. While carving (train tracking), I hold my hands a little farther to the side to leave room for angulation and the CM closer to the snow. In the trees, I keep them more forward and a little higher to allow for deeper snow and not getting my baskets caught on something(wrists straps off too). In gates, they are all over the place as needed. I really don't think too much about my hands, they seem to find the place they need to be for the situation (hopefully off the snow). Often something a little strange with someones hand position is caused by being out of balance as you know. One skiier I helped, wiped his nose on left turns with his right hand, his lateral balance was off. He was dropping his hip to the inside of the turn and compensating by bringing his right hand up and forward. I worked on his hip position which balanced him better and the nose wipe stopped.
In general, a head retreater has their hands too high (no ankle flex), a butt retreater has their hands too low (no ankle flex, but knee flex). If someone breaks a little at the waist, the hands are a little too low, but a flex at the hip in place of a bow forward will balance the body better.
Never seeing you ski, I really can't help you. The "sames" are derived from common attributes of good skiers and more for movement analysis than trying to copy the positions. The positions of hands, feet, etc, are a result of good skiing. "Form follows function" is an old addage that holds true for skiing. Once you are really in balance, the hands are a non-issue. Hope this helps a little.