As has been already mentioned, The goal is college baseball not a PG score. I would focus on individual school camps. Get on campus and in front of coaches at schools he wants to play for. Schools that match his skill set from a recruiting standpoint .
He's a big kid. And that will play well....Every pitching coach that sees a big RHP thinks there is more gas in the arm. That being said. You mentioned the possibility of a 3-4 MPH jump. That is unrealistic. The velo may never come. Or it might at some point. But remember a 3 mph jump is HUGE. Have him focus on getting outs . Spin it, Cut it.
Recruiting is about finding the right fit for the player and the program. Try to get him in front of schools where his skill set plays now.