Should I take the SATs again?

I'm a junior and I took the SATs for the first time this December. I got an 800 in critical reading, a 730 in math, and a 740 in writing. This matches up pretty closely with how I did on the PSATs, a 77 in critical reading, a 79 in math, and a 70 in writing. I feel I could do better in math if I took the SAT again. Math is usually my strongest subject (I have an A+ in Calculus BC and Statistics, 2 AP Senior cles) and I am leaning towards pursuing math in college. I feel that I could get an 800 in math if I didn't screw anything up or make any stupid mistakes, which I think I did this time. Would getting an 800 over a 730 make a difference to any college? Also, how does taking the SAT multiple times work? I've talked to seniors who've told me that only your best score from each section is reported, but from the College Board website I got the impression that your best overall test was reported. So if I took the test again, would I be able to just skip the critical reading section because I already got an 800 on it or would I have to do well on that again?