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OK, well I surely understand the procedure and that it can make a difference. The problem here is that we are usually dealing with some “slop”/tolerances, so what we work so hard to achieve is rarely achieved. In other words, you use the tool, set up everything as meticulously as possible, only to be disappointed when we use the timing light to check our work. New points should be set to the first timing mark (a little advanced) to compensate for initial rubbing block wear. Used points should be set in the middle of the two marks. .001”
difference in feeler gage settings is not going to make much, if any difference.