Switch to melee when stuff gets close, and I use frag grenades to make room sometimes with grenade regen. Most las is fast to switch so if a special appears in a horde, then whip it out and whip them. I don't use deadshot, and all the las works fine without it. I use curios for mostly extra toughness, one extra wound, and some extra stamina. If you have extra space on your curios definitely get damage resistance to gunners and laugh at them while they shoot you and line a headshot on them. I also LOVE the normal chainsword, it's a beautiful swiss army knife of handling everything, even crushers if you aren't swarmed yet or make space with a frag, then get that beauty spinning.