Great pics, Drew. Interesting that the "accepted" upright, head back mount is not necessarily the result of (or reason for?) the 3 in.+ drop on so many of the old guns.
Here is how I mounted BoWhoop when I had the opportunity to handle it in '09. Didn't know the pic was being taken at the time, I was too infatuated with the gun.
As you can see, I have a natural tendency to crawl the stock a bit myself. It is something that has developed by itself, or maybe I should say, without my conscious effort, over the years. It is very comfortable for me, and for some strange reason gives me more confidence.
SRH