First, I'm glad that the "big" issues have been solved.
That could very well be jetting in them. I am not sure what elevation your at, however, elevation can and will have a big impact on jetting. The higher elevation your at the thinner the air is. With that in mind, if they are set for sea level then you will need to drop your jet size one or two steps if your at 2500 to 5000 feet above sea level.
Can't remember if there is a pump adjustment on that type of carb or not, but that may also help. Be careful adjusting the pump though. Count the turns on the nut and set each one the same. If it acts worse then you can take the nuts out to the original setting. Hence counting and remembering the number of turns on the nuts.