Looks like we scared another OP away. No reply in over a week, in spite of many requests for operation data (EAT, LAT, DeltaP with one pump). We also need to know what your normal thermostat setpoints are. KJW, if you are still there. I direct you, if you are still inclined, to the Trouble Shooting Check List here- https://www.geoexchange.org/forum/t...t-pump-system-troubleshooting-checklist.3080/ We are still missing the data required for a proper evaluation of your system. Responses from would be helpers are all over the place ie. ACH, insulation, zone panel, stage control, energy audits, stud size, gauge accuracy, etc. Although, these are all relevant, I would direct your attention to your pumping and your bypass damper as major culprits contributing to your suspected inefficiencies. The good news is I believe your loopfield is performing as predicted or better based on your GeoSolutions Report with a Max Temp of 86F this late in your cooling season.