The difference between a 1490 an a 1510 is only a couple of questions. Obviously the 1510 is more aesthetically pleasing because it starts with a “15” but it really is not a significant difference at all. You’re within the mid-50 range for Stanford, both scores would put you a tiny bit bellow the 50 mark, so you’re in the middle of the pack. I doubt 20 points makes any difference. Right now, your recommendations, ECs, and essays are what’s important; those should be your focus.