I was really hoping that my May trip would drop and I could use a credit from that trip toward the August trip but it is actually $25 higher now. I paid $267.

But I'm going alone in May and August will be our family of 5 so I'm glad to get August for under $200. I still think there is a chance of a credit in May and maybe even August but I'll just have to go again if that happens and at least for now I've got the exact flights I want.
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You know, reading the terms and conditions on the tickets, it does say that to get the fares we did, you have to book two or more people at the same time. That may explain partly why you are unable to get May's trip for less. Although, they did just release the Spring Sale tickets, so maybe it will still go down? Good Luck!
I did go ahead and purchase the flights, I can't see them going much lower and I'd be kicking myself if they went higher!