Looks like less availability AUS-SAN-AUS vs the reverse but 01-02JUN you can do (per ita, haven't tried booked on DL.com) AUS-SLC-LAX-SAN-ATL-AUS for 4880 MQM at $178
26MAY AUS-ATL-SAN-ATL-AUS for 5409 MQM at $210 or 3.8cpm.
Everything I'm seeing for the ~$176 fare is requiring a connection in SLC at least one direction if you start in AUS which doesn't make it quite as good but still not too bad for summer availability.