The nice thing is the heads have stops on them so you know when the rubbers are seated properly, And I just made sure the carbs were in the rubbers as far as I could get them until they almost hit the vacuum plugs.

Now, I know there are 4 vacuum rubbers on the carbs. ALL of them have been replaced. I will try to locate more rubbers and see if they are ok.

I will try to work with the bike this weekend.
And I do have shims to try.
I also know a 42 pilot was a little small.
But the shims is an easy trouble shoot to try first.