Nice find!
Anyone willing to give up a few miles and connect somewhere like DTW instead of just ATL, to expand the number of available days to make this run, enter "~SLC,MSP" as your routing code in ITA (without the quote marks). That will exclude connections in both Salt Lake and Minneapolis which really kill the CPM, but still includes ATL and other distant hubs/routes. Connecting in DTW one way and ATL the other is 4.05¢ per CPM at the $220 fare.