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The 3mm allen head adjustment affects idle the most and also affects the rest of the range less and less as the rpms go up.
The gradual enrichment adjustment curve as rpms increase is a slope not a straight line because it's a mechanical linkage and the moving flowing air mass can change shape, compress a little under boost pressure, or expand a little under vacuum as needed to make it's way through the convoluted CIS intake air flow path.
I'm not smart enough to describe it better in an understandable way to someone that has no idea how it all works or may have never seen the air flow meter linkage mounted inside the cast aluminum top half of the air flow meter housing.
You'll never know unless you take the thing off and look in there and watch what happens as you move the air sensor plate up and down.
Also the 930 sensor plate moves in the opposite direction as an older SC sensor plate so the mechanical linkage is different.
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