I think the chance of a waitlist for 3 weekend days in August coming through is not bad, especially 6 months before arrival (that is, past the 7 month window).
I agree that you should definitely book a studio and get on the waitlist. That way in the worst case the waitlist doesn't come through, you still have the studio. Once the waitlist comes through, it will auto cancel your studio anyway.
And if you really want the club level studio, are you willing to take one of the three days if only one day is available? If you are willing to take one day at a time, you have a much better chance of getting it. The downside, of course, is that you have to change rooms. But in my experience, if you get one day at a time, you most likely will end up getting all 3 days.