You have a weber set-up so all the jets should be the same. However I would look at the fuel lines. Webers draw lots of air for an instant on the intake stroke then sit and do nothing for a long time untill the next intake stroke.That means they need to dump a lot of fuel in in a short time with no help or balance from the other cylinders. Look at the fuel lines and make sure you have 2 separate lines , one to each bank of at least 3/8" inside diameter. Also it would help to have 2 fuel regulators, one for each side. You also need a high volume fuel pump, at least 110 GPH with no more than 2 90 degree elbows in the total fuel system.
Perry.
