So as of this patch you can now be in the same party as someone that's outside the leech level range (6+ levels under or 41+ levels over the monster's level) and still receive the default exp from monsters while gaining bonus exp for being in a party on top of it as well.
So a thought occurred to me, what if you were to use this at Golems? It would require 5 other people in the party ranging from level 190-192 (since you have to be 190 to enter and Golem leech level is at 193), plus everything else you'd normally use (HS, Kanna, etc.). It would be difficult to set this up, but that exp would be amazing.
I think this would work at least? I haven't tested it out at Golems yet, so it's all theory.