There are more people applying for summer permit dates, but they also lower the number of launches per day late season. Probably not August, but definitely in September/October so its still hard. Coupled with it being a great late season trip due to Flaming Gorge releases its still very popular.
That said, you may have an easier time by trying to get a cancellation. Not super common in August, but September and October they start to pop up. I just got one for later this week by keeping an eye on the Rec.gov site. The down side is that they are a usually fairly last minute, so it can be hard for those who's life requires a few months notice.