The leviathan is super bugged in uvhm, i was shooting him forever and it wouldnt do any damage. Or his mouth would keep flashing open and closed and you wouldnt be able to shoot while still dealing with the fucking uber snakes. Thankfully i perservered and now have treasure room access. Picked up a fucking pearllllllllescent rocket launcher tungska, that thing is no fucking joke, the damage on it is absolutely off the charts. Also got a great fire plasma caster just in my first 2 runs and a purple cooldown trinket with 40% reduction (up 5% from my level 50 version)
pretty happy with the loot drops so far in farming. Also farmed a bee from hellquist which is level 61, so the damage is ridiculous when hiding behind two shielded missle packing slag turrets. I might respec down to one turret just for a bit more challenge.
or you could ditch the bee shield like a man