That map leaves a fair amount on the table, too. E.g., Lake County, IN and nearby into Illinois; Memphis and some other Mississippi valley areas like Baton Rouge into Mississippi; consolidating more of the Black Belt into Georgia/Mississippi/North Carolina.
Theoretically, it should be possible to draw a 538-0 Democratic map. I was able to get it down to 72 yesterday, but it looked pretty crazy in spots.
I got a 538-0 map with all "contiguous" states once (I made Oahu part of Alaska). I'll post it here at some point.