I have fitted many shotguns for customers for over 25 years establishing how much the stock needs to be bent to shoot where the customer is looking using a quality laser or occasionally a try gun when available. Once bent the gun is then taken to the pattern plate to confirm it is correctly fitted. This method far superceeds that of looking down barrels to see where the eye sits relative to the rib. You can be as blunt as you like but I suspect my experience in this proceedure outweighs yours, so recommending an adjustable stock is rubbish unless there is someone who knows how to fit it correctly. Technique has nowt to do with it, the only thing that alters fit is a change in stature.