I've used just 28GB so far bless, but it can go much much higher at times.
Yes, that's FastPath. The line is either working in FastPath mode or interleaved, as explained in this article:
www.dslreports.com/faq/2182
Looking at my service profile data, I can see that the line actually switched modes a couple of times even before I'd called, but I hadn't realized it. I told the support guy that my line was good as I'm really close to the exchange, so I think he's fixed it to FastPath for me, ie it's not in auto mode now. If I start to notice significant packet loss I'lk switch it back to interleaved, but I don't think it's going to be a problem.
Would be nice if Zen offered a full control panel A&A style for advanced users like us though. That ISP is unique with this feature and I miss it.
And hey, hope you get better soon dude.
