Vanderbilt vs state fullrider

Son got need based near 44k at vanderbilt for CS(cost 70k), full ride at state school, 18k CMU tepper.
Question is, my wage by commission only, and 2015 income low, if 2016 income higher by about 50-55k, expected Vandi aid reduced a lot(by 20k?). 2017 income so far not good, if 2017 income ends about same or lower than 2015, will Son’s 3rd year get about same 44k or more need based?

Also, he is NMF, will he get additional 2k at Vandi?

He likes tepper better, should we call or email to ask for any match?

Thank you very much

You could try.