I would use the basics to determine your operation. If the compressor was knocking then debris is a possibility, to me, a drier makes sense. After evacuation add back your recovered amount plus the required amount to compensate for the drier. (use drier mfg. chart).
At that point in restart use the basics. Condensor entering and leaving to determine heat rejection. Calculate subcooling in the condensor to insure liquid feeding. Entering and leaving of the evaporater along with suction superheat. Finally be sure your compressor voltage and amperage readings are in line. After all that, then maybe you can experiment with water rate flows and see what happens. Even though it is a cap tube system you might want to consider a sight glass after the liquid line drier.