Jax2, I'm a big fan of all of your suggestions, but there's very little bluegrass in those selections.
I guess I have to check out some of your selections then, as that's as close as I can come. Yeah, I suppose those are fringe, and bluegrass-influenced selections. They are mostly fusing bluegrass, folk and country. I'd say that Abigail Washburn and Gillian Welch have the strongest leanings towards the traditional. I guess I prefer them over more pure bluegrass, though I have not listened to much of what folks are recommending here.
Here's a few more, as far as my own tastes and exposure reach...
Iris Dement, "Infamous Angel"
Old Crow Medicine Show (self-titled CD)