We had a very similar situation. We arrived on Friday, June 17 from the airport to the Hard Rock at 10:30 am and our room was ready!! What a great suprise that was. We headed up stairs did some minor unpacking and headed out the door. We were at IOA by 11:15 and on the Hulk by 11:30! We did IOA first that day based on some great advice I received here, but had also planned on getting to the park an hour early the next day for HP (which would have been 7 am!). Turns out that wasn't necessary. Not sure if this is normal or just luck but I will give you the short version of our good fortune. At at 1:30 pm we decided just to walk over to the Harry Potter section just to see how crowded it was or if we could get in. I was just so curious to see it. To our amazement it was crowded by not crazy, Dragon Challenge was 5 minute wait! No kidding, I couldn't beleive it. We did experience some technical difficulty for both sides but rode them each with minimal wait. Then we walked around the area going in all the shops, which are too small and were quite crowded. We took tons of pictures and spent lots of time just soaking it all up. After a break at the hotel and dinner we came back at 7 pm that night and FJ was only a 10 minute wait! Again I couldn't beleieve our luck. We rode it twice in a row and again experienced some technical diffiuculty but over all it was quick and easy. We stayed in the area enjoying the nigh time view and went in the shops again. The area is small and we had no problem seeing in all between our afternoon and evening visits. There was actually no need to get up and do the early entry on Saturday, which is why we were able to get on Rip Rocket twice in the early am. We experienced all of HP by "playing it by ear". So I would highly recommend that. Since it was our first time I am not sure if we got lucky or not, but it definately worked out great!
Good Luck and enjoy your trip!