Over oiling will definitely reduce capacity a lot. I thought the oil charge was 6 oz but I could very well be wrong.

I wouldn't add more refrigerant the correct charge is 2.9 pounds and you used 3.

It sounds like you really did a good job. My only question is how hard was it to flush the condenser? Were you able to flush it out good and fast?
Was there ever any stop-leak added to the system?

Danny

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