@MilehighMike , I have a similar system. 640 watts of PV and 560Ah of LiFePO4. My system rarely goes below 80% state of charge. I've been running the absorption refrigerator off of 120vac instead of propane because I have so much capacity. I tend to switch to propane at night, but could probably make it through the night with the refrigerator on AC.
As stated by many in this thread, your batteries simply are not getting charged properly.
I use a Victron SmartSolar MPPT 100/50 solar charge controller, Victron shunt and a Victron Multiplus 12/3000.