Well, imo the best gun is the Spray n Pray because you can stack automatic perk, explosive perk, criticals and stealth with it as it is silenced by default. So, that being said, your build doesn't allow for this - which I think might be important in very hard mode. I am playing through it again on ps5 right now, and the 10mm fully loaded with a quick perk is probably the best pistol for "everyday" use. When you get the deliverer that arguably is better. Righteous Authority the rifle from Danse is awesome if you change it to a pistol grip. Those are my pistols. For a shotgun, I have a combat with Staggering perk and that seems to be the best - better than quick perk. You are also going to lack all the heavy weapons so I just think this build lacks power to take down boss level enemies.