Sounds like there is a fault with either the carbs or the plumbing. If it isn't responding to your adjustments as expected then there must be more to it.
Would it be worth investing a little to have the set up checked over and tuned by a specialist ? You will end up spending a bit on yet another carb anyway then there's the fitting, messing about, etc etc.
Once you are up and running I'm sure there will be second thoughts about selling up ?
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