That sucks Tim...I know the feeling of bewilderment...when my acros were STNing from the base, and I mean really slow...the rest of the coral looked great. The bali stag I've got I had fraged the week before the base started to STN, and while the base was going the two tips grew new tissue, and started to branch...It was like base was saying there was something wrong, and the tips had to opposite opinion. I really hope that things take a turn for the better for your tank.
Edit: Tim if you need an extra pair of hads for any emergency work give me a call...I'll PM you my #.