Did you try the Zoa Dip recipe from RC? It works well.
That coral dip is pretty amazing stuff. I had a tiny trumpet frag once that came down with some kind of jelly infection. I was pretty sure that it was a goner, looked really bad. In an act of desperation, I floated it upside down it in a small container with a cup of tank water, a cup of new salt water and about 3X the normal dosage of coral dip. I left it in there for 1/2 hour the first day; it looked a bit better so I dipped it again for one hour the next day, skipped a day and then 1.5 hours the next day, and finally a two hour dip two days later.
I don't know if I made any mistakes doing that, but it's the nice pink one with the blue mouth at the top of my tank. Not sure if you noticed it.
I've also had a few colonies of zoas that came down with some kind of white fungus that appeared over night right after dipping and adding them. I made a double strength dip with tank water and let them sit in it for about an hour then blasted them with a baster in the dip. Not sure if it's dumb luck, but it's always worked so far.
Maybe I should start rinsing. I always figured the ocassional, extra iodine wouldn't hurt.