[Burner]

should the right elbow stay against the right side during the backswing, or should it move up and away from the side and then back down against the side during the swing?

As a general rule, the higher the hands go up in the backswing the further away from the side the elbow gets.

Maintaining the flying wedge structure established at impact fix should ensure that the relationship of elbow to side never gets strained.

More importantly, perhaps, it is not good to allow the elbow get behind the hip on the backswing.