stormng vaults? ugh, nightmare, especially with Zlevels on and wandering hordes.
bring lots of fire. inceniardies. but even then many IWs carry 9mm ammo, so watch it.
acid is too weak, and IWs too fast. go for coupled matchhead bombs or explodey hacks.
The issue is the wide hallways. they can see and swarm you too easy. bring auto or burst weapons but prefer melee or explosions.
I looted 1; 3000 IW kills. I had lizard regen mutation, and i needed it 3 times.
Get down and secure the npcs as fast as possible, they will get mobbed.
if you dont mind the effort, try to drag some armor and a mounted gun dowb
set up shop on an existing vehicle
bring bandages