As mature deer don' t have alot of height difference, the height of a rub isn' t a good factor to figure with either. Know what I mean? There aren' t deer who are suited for say basketball, and others who are canidates for dwarf tossing.
I have to disagree with you, I think the heght of tine marks is the best way to determine size of rack. Even if a small rack and large rack buck are the same size, the tines on a good buck can easily reach over 15 -20 inches over his head. When I find a rub with tine marks past my chest (I am 6ft-1in),on a tree that will not give and bend, there is a very,very good reason to believe this is a mature large racked buck.
I still wouldn' t hunt the rub, unless there was a good line of them inside a bedding area. Now my blood is boiling just thinking about it
