It was mostly the ammo. You have resolved a lot of the issue by what you did to the chamber. I use a wooden dowl and wrap a pad of 0 or 00 steel wool over it and tape it off. It looks like a super size Q-tip. I put that in my drill and polish the chamber and I have another dowl wrapped with 3/4 of a pad that I polish the bore with. I do this every time I clean the weapon and never have extraction issues.
J.D. McGuire, Owner
AI&P Tactical, LLC
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Remington LE Armorer
Mossberg LE Armorer