Holley Street Avenger 570 Idling Problems

I'm running the Shell Rotella 15w-40 .
Been doing a lot of reading and research in the last week or so to refresh my memory on carb tuning.
My next step is to remove the carb this Saturday, disassemble it and give it a thorough cleaning and inspection. At that point I'll put the 54 primary jets back in, and close the secondaries, basically putting it back to factory specs. Then I'll start fresh again.
My only experience with having to crack the secondaries slightly was with a stroker motor with a radical cam. Really shouldn't have to do that with this engine/cam combo, in my opinion.
Through my research, I rediscovered a lot of info on the idle circuit and transfer slot, and the way mine is adjusted right now is not correct....with the secondaries cracked open, the main idle screw is completely backed off to get the idle slow enough. As a result, the transfer slot opening is not correct.
I'll keep trying...thanks for all of the ideas. Larry