I recently helped a friend start up a 9000 btu no name brand mini split. Put a vacuum on it, then open valves to let refrigerant into system. Due to a mathmatical error I added 1 lb instead of 1 oz of refrigerant for an additional 5 ft of line set. On start up the compressor went out on overload. Realizing my mistake I recovered all the refrigerant, evacuated and added 2.2 lbs of Virgin r22. The unit is still cutting out on overload. Could external overload be weakened??? Any suggestions would be appreciated. I obviously don't have much experience with mini splits. Thanks.