I have no idea how you can make 5k armor in this game at level 30, Mostly I have 2 mod slots in my clothes and half of them with armor mods. Others mostly crits. and damage. I bought whatever is available from vendors.Your armor is too low. On very hard, you need at least 3.5k armor to not get 1-shot regularly and at least 5k armor to tank through multiple shots. I'm at 6k armor before activated buffs and I'm able to clear through 4-star police waves and take hits.
And if you watch Fextralife or RPG division builds you realize that at level 30ish they have 1400 armors in most of their builds. The only thing I found that gives armor is ARMADILLO mods.
I would like to see your build and armors and it's mods. So I can understand what I am missing.