Hi Jason –
You probably figured this out by now but just in case:
I just got a Canon XF100 today and was tooling around for a while trying to get the Avid MC6 AMA to recognize the volume as well. The first thing is to down load the 2 latest AMA plugins. One is found on Canon’s site under the xf100 info page and the other is found on Avid’s site – it’s the MXF plugin. Once you have those two plugins installed – you can just dump the entire card onto your drive and link it via AMA – it actually works awesome.
As for transcoding to DNxHD – I’ll be tackling that in a few days.
Good Luck –
Frank