I have the same problem with my lvl 78 knight for thor leeching.
What I did. -> kill myself in thors BUT when i respawn my save point is TURTLE ISLAND !
It's an exp loss map, and i lure a bunch of dragon flies / pests to the spawn point
just die -> respawn -> etc , it's fast and quick, right on the respawn point.
Hope that helps. (and if there's no monsters around just break 1-3 dead branches !)