I'm gonna have to come back and read this whole thread, but it comes down to the specific combination, at what it likes.
I've seen tests where a 1050 dominator was no better than a (supposedly 1050) 4150.
Also... what spacer/adapter was used? Could definitely have an effect.
On the Dom he used an HVH 4 hole tapered 4150-4500 adapter and he said he’s never seen it loose power. It’s usually worth 10. So maybe it’s more the spacer than the carb.