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3X2 with center blocked off so your running 2X2. There are several things to think about.
Typically the 3x2 outer carbs are dumpers and have the idle circuit blocked. Plus other modifications can be done. The center carb does all the idleing. Have your other 2 carbs been modified?
Running a 2x2 and both carbs are in near stock configuration. Running rich could be due to the jet sizes. Have you synced the carbs so both are working the same. What jets are in the two carbs?