Has anyone here drilled their crossbar idle restriction in attempt to enrich low throttle settings?

This is what I mean:
https://1.bp.blogspot.com/-SS4acBSiF-4/WCnnC6FLw9I/AAAAAAAAMsc/Qb1P1LTCSJkipoQS40pcA6qgCReqRU8cACEw/s1600/carb%2B%2Baa106.jpg
https://www.inliners.org/tech/tech4.html

I'm hoping to send more gas to my 'upper idle port' when the throttle is slightly cracked. Currently my wideband o2 gauge goes quite lean, about 17:1, while cruising at low throttle settings.
If the throttle is opened just a little more, it enrichens down to 14. Sometimes this impacts drivability by jolting the drivetrain, and making the clutch harder to manage starting off.

I just drilled it from .07" up to .078" per Sam's instructions but didn't notice a big difference. Has anyone here tried this?

'59 Chevy Suburban, NAPCO