I am increasing the time between mem wipes on the adds to a lot longer. Should only be a problem if you hold them for a fairly long time.
The guy doesn't really require a tactic. It's just lock down adds, kill them one by one, kill named. But the difficulty of him seems to be pretty much out of place, when you are coming from Ascent. He hits pretty hard, he and adds mem wipe and they have awful lots of HP.
The adds also seem hard to mezz and break mezzes a lot. They can taunt, and memwipe, so keeping focused on a single target while not breaking mezzes on the others is very difficult.
This fight needs to be adjusted - either reduce the HP on the worms, or get rid of the memwipe, so a tank stands a reasonable chance of controlling them all.