Task Priority

The task priority in this model puzzled me,how should I do to solve it.I've searched on the Q&A about task priority and still couldnn't find the solution.
When any of the four processors is available,the ASRSvehicle should travel to input queue to load 10 items and then transfer it to the available processor for processing.That intention is simple and it is to make good use of these four processors.How should I do to realize that objective,since in the the current model,the ASRSvehicle will unload items one by one from processor3 to processor6,then ASRSvehicle start to load items from input queue and transfer to processors one by one from processor3 to processor6,which caused too many idle time for the processors.I'm look forward to your replies,thanks!

When an item enters the queue, the flow-function is executed and a tasksequence is dispatched to the asrs-vehicle. All dispatched tasksequences are stored in the tasksequencequeue of the asrs-vehicle and sorted by their given priority. One way is to write your own logic to sort the tasksequences in the way you like it. Maybe by changing the priority of every stored tasksequence.
The main problem is that the lined up items in the queue have been already sent to the next object. They wait all for a transport. And the transport knows the sequence of the next tasks to do.
What you see, is the past of the current model.