Rick Leathley
WKR
It sounds to me like the Stone Glacier Approach would be perfect for you. I know you Said Kifaru or MR so I apologize and you can ignore this, but if you have the time, read what others have written on here about Stone Glacier packs (high quality, light-weight, American made, with an owner/designer who is a hardcore mountain hunter and stands behind his products). The Approach fits everything you seem to want with the ability to change pack bags on the same frame if you desire http://stoneglacier.com/approach.html
I also thought SG Approach would fit the bill , but since he had excluded all other packs I passed in recommending it.
But he could run the Approach and if he needed more room just toss a dry bag full of gear in the load shelf. Once at camp drop the dry bag and suck it back down to day pack mode.
The Approach has built in spotter and tripod holders.
That my plan this year. I am going to piggy back an Approach on my terminus then drop the terminus at camp and hunt with the Approach ...