(Updated 2022.1.21)
I changed this build to even more relying nades. although the damage of shotty is reduced, but now the deck is also going well with M870/AA12 even Super 90.
to both stumble the mutations and heals more consistent. When you have bad team mates, use nades to run throught situations and heal a bunch as needed.
My friend got confident using this shotty build in NM even with blank issue, so why not give it a shot?