I guess my comments and thoughts come from these below. It seems clear to me. From post 58
An emulsion of air and fuel has reduced density, surface tension and viscosity compared to fuel alone. This increases the flow of fuel considerably, particularly in low-pressure difference operation, at low throttle openings or lower engine speeds. Just how much of an increase (richer) is dependant upon where and how much air is introduced into the fuel flow.
Here we are discussing main jet and WOT mentioning the larger air bleed, if increased in size, will lessen flow due to pressure difference. This speaks to the MAB being larger, less flow will happen - to the point of no flow if too large. Being the MAB is above the well of fuel.
The venturi vacuum in the well is reduced (the pressure is raised) by the "air leak" from the air bleed. This reduces the pressure difference that causes the flow through the main jet. If the air bleed were big enough, the pressure in the well would be the same as in the float bowl and no fuel would flow. Think about drinking through a soda straw with a hole in it above liquid level. Bigger hole, less soda. Suck harder, not much more soda. Big enough hole, no soda. This is the means by which the emulsion system can "lean it out on the top end".
Bewy, please, I am trying to understand this. If you are reading these statements from Tuner differently, can you please quote the words specifically and explain your understanding?
@MomsDuster Sorry for hijacking your thread with all of this, but I also hope we get some info posted that does help.