What are the best locations to farm solo in mayhem 3?

I have a gunner set to the 1hp build currently.

I've tried farming chupacabra and Traunt but it's not time effective (only managed one legendary in the entire run).

I've tried farming the dinkle bot (spent about an hour and having found approx 15 of the rewards and gave it to Earl. Net result = 15 common weapons)

I've tried offline farming the hoarder think in jakobs Estate (best result so far with approx 10 - 15 legendaries, - most of them were useless but still...)

Tried graveward (0 legendary) but I'm not strong enough to take him down fast so I'm just stuck.

I tried slaughter shaft but in not stronk enough for mayhem 1 let alone mayhem 3.

What about you all?