If you do shim the needles remember to re-sync the carbs after!!
In fact, ANYTIME you remove or make ANY changes to the carbs it is important to re-sync them. Otherwise you may end up with performance issues.
I have come to terms with the possibility of dying while riding, life has a 100% death rate. I would rather live having fun and end up dead in a motorcycle crash than never do anything fun because it's dangerous and I might get killed. No one makes it out alive anyway. - From a friend on another forum, used with his permission.