Don't think you are reading the chart correctly and making assumptions that are not necessarily true.
I will give you a magazine article to read that shows some Air Bleed testing at Westech Dyno.
Normally do not pay to much attention to their runs but in this case the info matches pretty close to reality. There is a "tightrope" that you walk on with air bleed corrections. The engine will tell you if it is happy but again, the dyno is not the track and a number on the track might be better but the engine is leaner under those track conditions. More power but more chance to hurt stuff.
So here it is, take it for what it is worth, you might understand it a bit better as it is a pretty simplistic article vs a typical carb design graph.
http://www.hotrod.com/articles/mopp-...m-carburetors/
You are also dealing with a Proform carb and not a true Holley carb so who knows what is inside of it and the calibration.
So what was the point of the picture you attached?
Tom V.