Not so much a suggestion of 'add on's' but since you've made a few mods., when you practice , shuck it with some authority to make sure it functions well. Under stress a fella sometimes gets a bit stronger and faster with the adrenaline flow going on. Just don't get to fast and short stroke it or you'll be left standing there with a good looking club.
Would also try loads other then 00 buck and see what patterns best at the furthest distance I'd have to shoot in the house. There are some nice reduced recoil HD loads available for shotguns these days.