800 is a pretty good score. There's nowhere that will hurt you; I don't think you need to worry about retaking it. 340 V seems pretty bad, on the other hand I don't think math grad schools care about your verbal score at all, as long as they can be sure that you speak English well enough to TA a class. If you are a native speaker (I'm assuming you are?) then I doubt that's a concern. Besides your writing score is decent.
I don't know enough to say anything about the schools you picked, except for some general advice, which is that if you're really committed to going to grad school make sure you have some safeties, especially if you're unsure about how strong your app is.