Any specific class mods recommended to beat son of witch at chaos 25?

I can’t even get to his red health bar. I get maybe 25% of his shield down and that damned bird shows up and heals him back to full no matter how much I shoot it.

Currently running a blank slate classmod that dropped with a 40% total damage increase, but wondering if something else might help me get by him.

40% should count for everything right? Guns, spells, companion? Running a spellborn class