Calling on Holley carb experts!!!!!!!!

I have a Holley carb with 4 corner idle. I have researched and cannot find a straight forward answer to what I am about to ask.
I have been read and been told by a professional carb building company that the 4 corner idle carb should be turned out about 1 1/2 turns. I have tried 2 different Holley based carbs and on my engine neither did very well at idle with all 4 corners turned out more than 1/2 turns.
I have an afr gauge to help with tuning. If adjusted to 1 full turn on each corner it will bellow black smoke out the exhaust. My question is, are there any drawbacks to only being able to gon1/2 turns vs the 1 1/2 turns they suggest?