drillman -
I read your post last night and "saw" "amps" and then "thought" "voltage".
The info in my previous post does not apply, but I'll leave it in case anyone would like to get info about "voltage imbalance".
I'll email you an article about current imbalance, as I don't think it would cut-n-paste well.
While you have a 4% unbalance, it looks as if you are ok.
It is not unusual to have higher unbalance at no load than when the motor is under load. Were you reading taken under load or no load?
Steve