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The problem may just be the extreme load on the unit.As a rule of thumb, 20 degree below outdoor temperature is doing a good job. There are a couple of things we can look at.
1. Is both indoor and outdoor unit running?
2. Do we have good air flow at registers?
3. If you have a thermometer is there between 17 to 20 degrees difference in air at return grille and supply registers.
3.Is the large copper line between units cold and sweating?