Rear overhang ? What is that ? You saying that a 6X Leupold can't be mounted as it is on the #1 ? Balderdash ! Unless you make a habit of dropping your rifle on the ocular lens ! As long as the front ring isn't hitting the objective bell, it's another non-event.
A far more common problem is too tight rear rings messing up the variable feature of scopes by impeding or blocking the sliding guts from working.
Unless you cannot match a scope to the rifle it is going on, there is no reason for extension rings.
This is the way it was done in the 30s. A 257 Roy and an 06'. Sure looks strange to us modern folks, but both rifles will shoot 1" or better groups.
IMHO ..... trying to make something of nothing.