I don't know if this is your problem or not, but you are forgetting a
major part of your equation. The condenser. If the condenser cannot
remove the heat that's being removed from the house, the system will not
work as efficiently. What shape is this particular condenser in?
--Mike


The condenser fins are slightly damaged on both units from a hailstorm. This happened before last summer, so the units
performed fine last summer with the damage. Both condensers are clean as far as I can tell from the outside.