Need a temperature and pressure reading before the captube in the liquid line, a temperature and pressure reading between the evap and compressor (closer to compressor better as it gives true superheat at CP). Need a drybulb and wetbulb reading of the ambient air temp, and water temp at time of reading. A snapshot of these readings at start and at nearly operating temperature will give us a pretty good idea of the current state of things. Also, check your amps on that compressor compared to the RLA/FLA rating on the tag when at operating temperature.
If you also get a drybulb reading of the air coming out of the evaporator, I can check how close it comes to target evaporator exit temperature. That tidbit will help you decide if your airflow is too high/low to be an effective dehumidifier. You should adjust fan speed, not evaporator size! It will be a balancing act between evaporator temperature and superheat to get best results. But remember, the higher the ΔT between condensing and evaporating, the lower the output, and the higher the energy usage. If the fan is a pusher, you want to make sure the coldest surface (inlet) is farthest from fan and the suction closest. If its a puller, it would be the other way around.
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