I think it fits the mix pretty well too, but that's another thing I'm still tweaking a bit. The body of the kick is actually around 60hz, and then there's a pretty sharp roll-off right there. Maybe even just a more shallow roll-off would be good...
I mixed for a while, turned on the Finalizer and mixed for a while, turned it off to listen, liked it and didn't really adjust anything else, turned the Finalizer back on, then added the other mastering plugs before the Finalizer... That's the long answer for "Yes, I mastered during mixing", haha.
My work flow is always open to change, but I like putting the Finalizer last because it seems to perform better when it's receiving a signal that has already been somewhat leveled out...that C4 in my chain helps tame the meters a bit. Notably with guitars and toms, I'm sure you've found that the Finalizer likes to produce audible clipping at times when you wouldn't expect it to...it's frustrating. A little bit of my loudness is coming from the Inflator too, but with this project I actually didn't have to try very hard to get the loudness, which I think comes down a lot to the mix itself.
I spent like an hour yesterday reading half of this really fantastic thread on Gearslutz about Ted Jensen/loudness...it's like 20 pages, but you should check it out:
http://www.gearslutz.com/board/mastering-forum/62358-ted-jensen-whose-watched-him.html