You have, what I would consider, the perfect ADR time for this restaurant (8:15 is even better than 8 because it gives you a bit of wiggle room, while keeping all the benefits - see below).
As posted above, plan to arrive at the park by 7:30 am. Head to the left side of Discovery Island (toward Africa) as you are coming in (you will be let past everyone being held at the rope here).
Check in as soon as you can (chances are, you'll be let in at about the same time as the 8 am ADRs).
If the park is opening at 8 (e.g., morning EMH) have one member of your party get Safari FPs while another member checks you in to breakfast.
You can save time (and $$) by skipping the photo with Donald. On our last trip, we had an 8:15 ADR, skipped the photo with Donald, and were one of the very first people seated and visited by the characters (buffet was also hot, fresh, and virtually untouched). We were done with breakfast a few minutes before 9, and were on the Safari (with no wait) a couple of minutes later.