What am I doing wrong for Mayhem 10?

I’m new to Mayhem. I want to enjoy it, but I’m not. I’ve farmed some good weapons, and I can melt most normal enemies with an OPQ, but anything armored takes almost no damage from corrosive weapons. I have to use my radiation Sandhawk on tougher enemies and bosses to get any decent damage output. I can usually melt GW with a Krakatoa, but even with a M10 one, I barely scratch him. I should be doing a ton of elemental damage. Am I missing something? I really don’t want to change my build, because it’s so much fun.

This is my build.

https://bl3zone.com/build/1426/amara/hellzerker-build-lvl-57-updated-by-lazydata-on-twitch

That is basically the same build I am using.

I play on MH10 and I use the modifiers Lootsplosion/Corrosive immunity&nova/90% less status dmg/buddy system.

I am melting most things but I am mainly farming gear for this toon and my others so I am running 4 maps:

Konrads Hold
Carnivora
Cathedral
Cartel

I haven’t touched any bosses except Joey in Cartel.

I am having a blast and a friend who has almost the same build as I do is with me and we are destroying everything.

If you are on PC you are welcome to join us. I will be playing tonight around 5pm PST

I appreciate it, but I’m on PS4.