Your shore excursion tickets ARE your priority tickets. Only going as early as possible gives you the best opportunity to maximize your day on GSC. If you happen to be in the Haven, you can be escorted to the security line to board next available tender.
By the way, did you book a Villa, or, a cabana? Cabanas are on the main beach, not nearly as nice, and will not receive the same type of overall perks, as the Villas at Silver Cove receive!
* Latitudes status might, or might not, be noticed for either situation, with the exception of ShorEx discounts. *