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 That makes sense. I've yet to finish my 16" 308 build. Maybe I'll find the issues you are talking about. 😅  
 Or maybe you'll be one of the lucky ones that gets it set up right the first time.
Let me know if you do run into issues. I may be able to help.
 
 I *think* I have most things figured out. The one thing I don't know is if the gas port on the upper is sized correctly. It seems some of them aren't from Aero... So, I may end up having to pull the upper apart if it is undergassed.

I've got a solid plan for the buffer system:
A5 length buffer tube 
Tubbs rifle length spring 
Odinworks heavy adjustable carbine length buffer 

I am going to spend the money on a set of go and no go headspace gages. I'm not playing around with 308 being out of spec. That gets into big oof territory if that is wonky.