question

Yes, you've used an instanced process flow for processes that sound like they should only be done once - anything in an instanced process flow applies to all instances - of which you have 2 floorstorages. The AGV template also does this but has a trick to allow only one token to persist in certain parts of the flow. You could use that as an example or remove the parts of process that should be done once and put them in their own process flow.

The first thing to determine is which parts of your process should only be done once and ensure they only get one token (by the AGV technique or putting them in a general process flow).

You're only using current in one place, so you just need to replace that with some way of finding slots by token.StorageArea. You could put a label on the rack called StorageArea by which you could match the slot, or use the Address Scheme to identify by the AisleID or ZoneID. Or you could use port connections from some object to the racks to find the rack object based on token.StorageArea as a port number and then use that as a direct substitute for the 'current' parameter in the findSlot activity.