NTCH has never worked for me, whether shooting irons or a red dot, squared up, bladed, or whatever kinda position I'm in. I feel like I'm crammed up with the stock in too far or forcing my head forward with the stock in a comfortable position. I'm not tall either, 5'10", with regular length arms, but I have wide shoulders.
I run my stock in the number 5 position on guns that have the A5 setup, which would be one position in from fully extended on a regular carbine extension.