Again I would not be so concerned with backing them out to 3, sounds like you did it correct and just what the engine wants.
FYI for inquiring minds, I always bench set my idle screw to 2 turns rather than 1 1/2. I have had engines not run or stay running at 1 1/2 whereas I have never had a problem at 2.
And again my biggest concern is if you are not getting a response to even minor adjusting of the screw.
Bill White
White Automotive
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HAVE A NICE DAY!!!!