HFT and Ft are completely different when it comes to set up . With Ft the better the fit the better the shot release is , with HFT the shot is so steady there is room for compromise in the stock design . That's why I mentioned standing because that's where the game is the same. I set mine with my eye shut then see if the image is good when I open the eye.
My comment was not a critism just something that may be a good addition , which was what you were asking.
Building a stock is a very individual thing and is incredibly difficult to get right first time , but can be very rewarding when got right.
That's why I like my Steyr because with 3 individual pieces it's far easier to make.