Dear Kevin Camp,
I’ve come across the same problem as Heath Alseike, and I’ve worked through your solution.
Everything goes according to plan until I import to After Effects. For some reason when I ask After Effects to “interpret Footage” the settings for the alpha is greyed out, so I can’t select “premultiplied” sticking me with a .tiff file that has the halo of black/white that you mentioned.
Is there something I’ve missed? Perhaps something in the preferences? It’s quite frustrating that I’m so close, yet I bet it’s some trivial detail that’s keeping me from finally getting transparency lol. I’m running After Effects CS5.5 if that helps at all.