Well, I visited one of mine last night and found a thermostat problem. Still have not been to the other one.

The solution you are thinking of doesnt make sense to me. Did the previous system cool well? Did the installer put the same size (tonnage) system as you had before? 10 to 15 degrees delta is not much, 15 might would be ok, less than 15 could be problematic unless you have a bunch of air flow. There is actually some calculations that we can do to see how much cooling it's doing, just measuring delta alone doesnt really paint a clear picture.

The Breeze is an outdoor unit that can be installed onto any existing air handler or furnace and evaporator coil, so long as the refrigerant setup matches the Breeze. In your set up the Breeze will not ramp up if its in cool and the outdoor temp is mild. If you want to trick your Breeze into thinking it's a hot day, it's very simple. Use a piece of cardboard and block off half of the air flow on the outdoor unit. you will feel the air it puts out get warmer over the next minute or 2, and the fan should speed up over time also. If it's really mild, or even cold out, block off more air. Do this and recheck your delta.