Well, spoke too soon I guess. Took the car on an a lengthy trip last night when I got home I could smell roasting brakes. It didn't get nearly as hot as it has in the past (before there was smoke), but you could smell it. I'm at a total loss now and the only thing I can think of is the new wheel cylinder at some point is failing to collapse. Before I took it out I had the back end in the air and tested the brakes with the tires free wheeling - everything seemed to be working just fine.

Going to swap out the new wheel cylinder tonight...I'll post back.