I think Annie gave you some great advice. We tried to book in June and were only able to get 2 nights together. We ended up changing to July 4th weekend and were able to get 4 nights together. You have to be online at 8 EST to book your room! I think if you wait until MS opens at 9, it will be gone. I had better luck with Explorer than Chrome. I also second only putting yourself on the reservations. It takes several minutes to add everyone. I would also book the waitlist in small increments. You have a better chance of getting a day or two, than a whole week. You could always add another day or two if your waitlist comes through.
Good Luck! We are looking forward to our trip in July!