Holley/Demon Carb stumble

I understand.
I don't wish to undermine anyone else's suggestions..
Just a thought, beings the specific gravity of fuel doesn't change with altitude (sarcasm) but air does (you're at 9000ft right?)
I'm wondering if your issue couldn't be resolved just by simply reducing the low bleed by a couple sizes, in an attempt to 'bring in' the fuel at the booster sooner? It might be worth trying if you have some on hand, even if it is to prove this wrong.
just a thought, don't kill the messenger..