Good decision not to retake. Super score of 1530 is more than high enough, such that the time spent preparing for another retake would be better spent on other aspects of the application.
Especially as your verbal SAT testing history appears to be 730, 710 and ? [but less than 730], it might well take a lot of effort to get into the 750+ range and the 20 points superscore difference just wouldn’t be worth it, especially with NMSF - btw congrats!