I'll drop the airflow...perhaps it was just a coincidence that I was getting fewer of these readings with airflow set to MAX. So that I understand this, the less airflow allowed through the ducts, the less possibility of static pressure, and consequently an excess static pressure stagedown event? Dropping down to HIGH, or even MEDIUM if need be, would then resolve the excess static pressure stagedown issue?
Old A/C was also 5 ton. The house is probably about 2400 square feet with a basement that is about 2000 square feet. The family room has vaulted ceilings that are about 15 feet tall. The basement is its own zone, which does not kick on in the summer.
If setting the airflow limits to medium or low resolved the issue and the house still cooled just fine, would that create any problems with the unit itself?
There is almost no trunk system for the bedroom zone, and the runs are the round insulated flexible ducts. Do these round flexible ducts carry substantially less CFM than the rigid rectangular ducts?
So I guess an extra dump run wouldn't help much? Although it would be a bit of a waste, if it would help I could add a dump to the garage.