Personally I would cancel the Premier Access.
Priority embarkation for suites is better. I would arrive between 10:30 and 11. If you are at terminal 25 go to the far left doors for Retreat. You will be taken upstairs to the suite embarkation lounge to be checked in and will be escorted to the ship as soon as it's cleared for boarding. Luminae will be open for lunch around 11:30 or 12.
Suites have reserved seating in the theater on Chic nights, really no big deal, not the best seats in the house. I've never seen the need for reserved seating in the theater on Celebrity. Just arrive about 10 minutes before showtime