Sharkky -
Did you ever get your macros to take off? I just read this thread, and the first thing I'd try would be a 12 hr photoperiod (not 24/7, which I think you already changed) and more light. In the most basic terms, algae need very little to survive and grow...light, CO2, organic waste. So, if your nitrates are measurable, the algae should be happy. The only thing that I can see missing is light.
Another thought I had about the macros...some of them grow by depositing calcium carbonate. I don't know what your calcium levels are, but there's a (slight) possibility that this is the problem. But overall, it looks like the problem will right itself with the new DSB. Hope things are improving!
Sara