These missions that pop up in Sanctuary aren’t current level. What’s the point of doing a lvl 11 mission when you’re lvl 53? The last mission was on Eden 6 lvl 25. Please fix!
Use Mayhem mode.
If you’re in Normal mode and have beaten the final boss then you should have the option for Mayhem mode. Just setting it to Mayhem 1 should give you level 53 drops. Not sure, though – if you accepted a side quest prior to beating the game & left if unfinished the drop may still be the level you accepted it at?
Doesn’t matter in Mayhem.