Grand Prix 500
Main Motorcycle: 1973 TR7
Join Date: Jul 2012
Location: Hickory Creek, TX
Mikunis are no more difficult than Amals, especially the VM (Round Slide) Type. Difference in circuit layout, but same principles in function. As Mr. Pete suggests, would try swapping the carb from left to right, easily done and best way to make sure this is your concern. I would remove the right hand carb and go through it again.
As it really seems you are running rich/flooding, pay careful attention to the enrichner (choke), idle air/fuel screw and float height. Enrichner should move smoothly and fit snug in the body. Several options out there to replace the plunger if you like (plunger, cable, lever types). Would verify the float height. Don't remeber spec off hand for the VM's, but quick search should pull it up. Check the needle and seat while your at it, just for kicks. Remove the idle air/fuel screw and make sure the passage is clean with carb clean and blow compressed air through it from the body out. Port should be just in front of the slide if memory serves. Check the oring, washer, and spring are all in good shape, as well as the needle itself. Run them in until LIGHTLY seated, then back out 1 1/2 turns (baseline). Don't over torque the air/fuel screw as you can mushroom the tip and break it off in the body. Carb is typically junk at that point, as almost impossible to get the tip out.
Last thing would be to check the carb slide and needle. Make sure the needle is true, and on the middle clip groove. If it is raised (not seating into the body/emulsion tube completely) whether bent, wrong clip position, or otherwise, even at idle you will pull a huge amount of fuel through. Same if the slide is sticking open.
A GOOD friend will bail you out of jail, a TRUE friend is sitting on the bench next to you saying "Damn, that was fun!".