Spam Haukke Manor HM. If you can find a group to go with you for consistent back to back runs that would help, too. Gear-dependent you could also do all 3 old HMs, unlock the new HMs, and spam Brayflox instead - but you'll need at least a few i70/i90 pieces to heal through any multiple pulls the tank might decide to do (though I usually take it pretty slow for fresher healers, still get it done in sub 20 min tho).