Well, assuming you don't run into the 6 guest limit or an issue getting them late, you've got one GAD voucher for each day with two left over. Since you have park hoppers, you can use a second GAD voucher on two days. Which ones are your choice - most would probably take DHS and either MK or Epcot.
However, you may need a manager to override the system as the computer prevents the CM from scanning a park ticket a second time for a GAD FP. They are allowing doing it at more than one park, but it requires the override.