Question for Holley carb gurus

Aside from the stinky rich idle, a lean flat spot at tip-in before the mains start, because the transition slot was being used up?

I think on many (if not all) baseplates the secondary t-slot is considerably further up the bore than the primary. Your primary slot should be exposed "square" but no more than .040. The secondaries will likely give you too high an idle speed if they're opened that far.