It's a tough call. What are his section scores on SAT and how much do you expect his score to increase?
Personally, I'd say go ahead with the VIP app. I was accepted as an in-state Early Action last year and I know a professor in UVM. Once he told me that if you got a >550 on every section, you'd probably get in. But, again, i was an in-state, so it's a tough call.
If you are sure that your son's score will improve over 90 points, then it's probably good to wait and see. But given that he has a great paper and EC, I'd be pretty surprised if he gets rejected w/ a VIP app.