- READING A VACUUM GAUGE -
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https://www.motor.com/magazinepdfs/082001_05.pdf
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It's been my experience that curb idle speed is below the RPM that mechanical advance kicks in so that is not an issue
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If you are attempting to balance fuel mixture by RPM only, as the mixture balances the RPM will increase. Here come the CENTRIFUGAL ADVANCE a$$-u-ming the DIST is operating/calibrated correctly and/or the curve may have been modified). You then decrease RPM to CURB IDLE and start again.
In effect, you are chasing your tail.
To properly time/balance fuel trim on an engine it will require much more that a TACH.
Your procedure is fine on
your car. But you should not convey to others (IMO) it's the only method that is available and is SURE-FIRE (pun intended).