I sent a 500 on the Spanish SAT II by accident, and I received notification that my schools have gotten it. Will having a 1530 SAT, and 800 Math II, 750 Math 1, 740 USH, 740 Chem, and 720 Bio offset it?
Don’t worry about it. College’s will just think you were having a bad day. Your other scores show consistency.
You do have some good scores and many of them as well. I would recommend that you take it again if you can and send a better score since colleges may make the assumption that you lack proficiency in world language. The 500 is definitely a huge outlier from the others, however. Because we really don’t know what goes behind the scenes, I would say that it isn’t safe to make assumptions. The decision is yours, however. Good luck 
I’m curious why you took so many SAT subject tests. Most colleges that require them don’t require more than 3.
Nope. Waste of time. Just move on.
Yeah, that was my first thought too, especially taking M1 and M2. But what’s done is done. It’s likely that AO’s will just focus on the best 2 (excluding the duplicative M1 score). If you get rejected, I highly doubt it will be due to your Subject Test scores.
It is fine. Just don’t apply as a Spanish major!