Hi mate.
You are experiencing the same problem as I am. In the May 15 SAT, I got a 2170 (CR:720 M:780 W:670). Although my CR and M scores were good, writing honestly sucked (because I knew had the ability to do way better). So I gave the June SAT, but scored way worse all together. It was a 2070 (CR:630 M:730 W:710). Although the writing score turned out to be better, the drop itself was devastating.
The only positive thing to the entire debacle was that my SAT super score had gone up: 2210. I’m indeed relieved that my super score crossed 2200, since Duke, Dartmouth and all those top universities super score. However, I’m not too sure whether the drop will prove to be a detriment or not.
I had started two very similar threads regarding the drop on which I received quite some feedback. You can check them too; I’m sure it will assuage you. 
I hoped I helped you