A bigger carb is NOT necessarily the answer to your situation. A bigger carb does NOT mean more fuel. Bigger jets and smaller rods do. If that carb can't be jetted to make your combo run, I suspect there's another issue.
Others will have other opinions, and I'm certainly no expert on which carb is best for you, but remember, large carbs aren't the best for street use.
And as I read your post, you ran the largest jet smallest rod you have available, and "viola!"
If you have "viola!", why do you need to change the carb? What's the symptom you're still trying to cure but that you still have "Viola!"?