SAT (first attempt): 690M (ouch), 800W (10 essay), 770CR - 2260
SAT (second attempt): 800M, 700W (9 essay, ouch), 770CR - 2270
ACT (first attempt): 35C - 36M, 36S, 34E, 33R, 18 Writing (OUCH)
As you can see, there are “ouch”es everywhere. However, I should note I’ve won a pretty big writing award, but ACT didn’t like my writing. 
Submit them all. They super score all individual best scores like your 800M, 800W, and 770CR (2370!!). Send all your test scores; I always find it better to have “nothing to hide.” Trust me; I even sent my very first (and horrifying) SAT score (660M, 500R, 550W) and got admitted! That way, MIT could see the progress I made in between test sessions. Also, it is known that ACT has had problems with Writing scores. I’m sure MIT is well aware. Your test scores are great. Don’t worry! Focus more on your essays and interview! Good luck!