I'm pretty sure that any of the oozes in the NW corner of Sunderrock can be his PH. I've seen him in several different locations and just killed as many of the oozes as I could and then let them respawn until Sulfurog finally popped for me.
Seems to me this quest isn't even worth doing. I have 3 tradeskills over 200 and thats only because I haven't invested aa's to bring the others I can over 200 skill. My point is, a finished artisan charm and tsing (sure takes time but hey its called everquest right?) my others to max gives me a co