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Start with knowing if you have proper airflow.
Measure supply pressure,return pressure, find your total external static pressure and check the blower performace chart.
Then, only then can you take all these measurements.
Air entering the evaporator.
Air leaving the evaporator.
air entering condenser.
air leaving condenser.
entering wetbulb temp.
liquid line leaving condenser.
liquid line entering evaporator.
suction line temps at the evaporator.
suction line temps at the condenser.
compressor amps and voltage.
Take notes and see if your superheat and subcooling is where it should be.once she dail in then check to see what btus you are getting.
CFM X enthalpy x 4.5=btu.
Once you comment yourself to taking all these measurement
it will become easier to do.
It also help paint a bigger picture that will help with design and setup on all your other installation.