Quick update - the change to the blur radius and shadow samples is looking real nice, it's just slowing the render to an absolute crawl (it was taking about 20 minutes before, I have no clue how long this is going to take).  I'm going to kill it here in a few minutes (I want it to get down a little lower on the door wall to see how that looks before I stop it).

I know better than to change multiple things at the same time, but I did it anyway.  Does anyone have an idea of which parameter is slowing down the render?  Blur radius or shadow samples?

Thanks again for the help.