It sounds like you just need the fuel curve adjusted. Do you know what size and how many emulsion bleeds you have?

its not the power valve itself, but the channels that flow the fuel when it opens, the 4 window probably wont due a thing, or the larger needle/seats, if you look at the small holes under the valve you will understand, no matter how much the PV will flow still has to go thru these...this one area they worked on with the newer carbs

I understand the New Better Improved aspect of carbs, however, nobody has said "That is a known area of concern with that carb" so I must have something causing this problem. I am trying not to just Pig Fatten the lower rpm to compensate. I'll install the $40 parts, put on a big vac. gauge and try again.
There must be something I am missing, I am far from knowledgable about carb tuning so all help is welcome.

Was this carb running OK and just started acting up or is this a new set up?

New set-up no history on anything. New rebuilt motor new rebuilt carb new rebuilt everything. 4 hrs total water time.

I think 11.4 afr at idle is rich. How much of the transfer slot do you have showing on the primary side? Should be about .020.