I do stack some AGL (in MABless slots), have max QD merits and still get resists on some NM's (like Iron Giants) /NIN.
I have no problem holding/kiting the mobs for a while, although I usually end up fking up a lil as one hit means 3 shadows gone and if they get another hit in while casting thats ~40% HP gone. Regarding the Iron Giants, I know I wouldn't be able to solo one (except the Vunk or attowa ones) while im getting som uch resistence.
