With his grades and rigorous course load it does seem like he should be able to score higher. Has he tried the SAT as well - some students do better on one than on the other. Also consider getting a tutor to hone in on what could be the issue on the tests. My S’ friend had a GPA just below 3 and an ACT of 34 and he was wait listed at Tulane.
Of course, it’s definitely a good idea to find some other achievable colleges to love. I will agree that Lehigh is equal or greater reach than Tulane but a good shot with ED. Particularly if you have some diversity factor, including geography.