Memphis 91
I've used the same size compressor 5000 BTU with a cap tube. Its working extremely well. I would go with option 3 A larger compressor will just cost more for operation. I think take a few days and with the Kill-o-watt meter and pencil slowly drop the charge and see what you get for energy in and energy out. Don't get too hasty. You may be adding some variables that could cause further complications. I would do some additional tests before adding the TXV valve.
Randen
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