Greetings - like you, we are a larger party size (6 gophers - 2 adults, 2 adult-sized teens, a teen girl, and a lil' gopher pup). Also like you - we are going in mid-June (June 18-22). It appears, however, that for now our vacations are ill-timed, as most all the "perks" (APH rates, ticket deals, etc) are for those traveling BEFORE June 16.
That said - I called US today to reserve some rooms. I was quoted the same prices you see on your computer website ($251 for the std 2 Q, $278 for the water view 2Q). I went ahead and reserved the std rooms because they will give you the APH rate if/when one comes up. Best to have on reserve first...
One thing we have found - staying on-site and getting that Express perk is so good, we don't find we need to stay as long. So I second the comments from others that even spending 1 night - perhaps your first night? - over at a US hotel would mean maximizing your ride time for 2 days. (Only place that doesn't work is Potterville - but for the other "big" rides, like Spidey, Hulk, etc. - it REALLY pays off). Then you could move to a (cheaper) hotel for the rest of your time and take more advantage of down'-time, pool, etc. We have stayed at all 3, and 2 rooms at RPH works best for us (gives you 2 bathrooms too).