Mike Austin's image of the "7" is a huge key here....
When you have 'set' the right wrist angle, at the top, you have also 'set' several other angles - one of which is the angle of the shoulder line and the left arm (the "7") - if you think of that relationship, and the concept of the right hand and shoulder BOTH moving DOWN at the same rate, you don't have to think much about the hands at all. Personally, I find that thinking of the back of the left shoulder more helpful, because getting it back behind the ball, gives the hands and arms the 'inside' path, that the right shoulder can then drive DOWN until the angles are released as the right arm extends downplane - this is the 'rock skip' motion - setting those angles, and getting the right shoulder down for the 'throw'