Need help tuning Quickfuel carb

Well the main jets on this quickfuel carb don’t have anytning to do with the idle circuit.
The idle circuit is ran on the idle feed restrictors and the idle air bleeds and the 4 idle mixture screws.
The main circuit starts to come inn around 2400-2600 rpm.
It makes sense that it could be going lean on the mains and the missfiring that I’m hearing and feeling is a lean missfire.
I was just instructed by the person I bought the carburetor from to drop down to 65s because of the elevation.
But it’s possible he was wrong and the engine wants more fuel at those rpm’s for whatever reason, maybe it’s the amount of timing I’m running, and the quicker advance rate, i don’t really know.
Ive never tried running a larger jet in it so it’s worth a shot I guess.
It’s just confusing when you see people say glowing hedders is from too much fuel and other people say it’s from
Not enough fuel or not enough timing.
No one seems to agree on what causes it, you have guys that insist it’s lean conditions that’s cause that and guys that insist it’s rich conditions that cause it.