So I had Chancey & Reynolds come by today to check the unit since they are the ones that put it in. You'll never guess what the diagnosis was... everything checked out just fine! The coolant level was where it should be so there were no leaks or signs of freezing. Pretty much just got the "20 degree difference" line again. My own thoughts are confirmed, it isn't an HVAC problem it's an energy/insulation problem.
