You can try changing the path weight in the path settings, and also add barriers like in this model.
barriers.fsm
As far as your other question, that can be achieved with process flow, but I watched your simulation for 4000 seconds (simulation time) several times and I never saw operator3 move boxes from Cosmetics and Packaging.
This can be achieved in Process Flow. You would have a source that fires when your batch of objects enters the queue, and have all of the items in the queue pushed to a list on entry to the queue. Then have a pull from list with 10 or 1 objects depending on the case, and then travel and move objects to have it move them to the next spot. If you can provide more clarification on how and when Operator3 is supposed to go to Cosmetics and Packaging, we can help you implement this into your model.