Great news!
And it is a great example of [a] how perseverance pays off in getting the idle timing correct & doing this BEFORE touching the carb because it can affect carb idle calibration.
What about cruise and WOT? My low-speed cruise AFR seems to be a bit leaner too (since I'm on the t-slot and there is a significant contribution from the idle circuit). Haven't had a chance to drive out to the highway and do some short blasts...