Carb tuning, larger accelerator pump nozzle?

That's the trouble Rat you have said it again, & I am sick of reading your nonsense. What you say above is the exact opposite of what you said in post 65: decreasing the size of the MAB will delay the mains.
Have you got a 3rd version for us?
Then you add some nonsense in post 76 about 'a weird situation' when a power valve opening at idle causes a rich idle. Not weird at all if you understand how carb works....For this to happen the t/blades have to be open too far at idle, causing the main system to start.