pitching velocity

Get a god pitching coach who understands body movement and velocity training as well as mechanics. Don't get someone who cannot teach, but knows how it is "supposed to look". I see so many instructors who know what good mechanics "look" like, but are incapable of teaching them.

the Florida Bombers
"I love the HSBBW"

It's amazing that athletes playing other positions throw very hard and when asked to pitch, throw 10 mph slower. When athleticism is left out of the equation of proper mechanics, this is the result. An athlete is taught to move his body in a certain way to pitch a ball and gets the athleticism sucked right out of him. The pitching program at pitchingcentral.com and theathleticpitcher.com would well be worth the investment. Also, with the size of the kid, I would have to ask about his functional strength.

First make sure that the balls from the outfield really are smoking. Most of us can be deceived by how a pitcher throws. Some pitchers look like they are throwing hard but aren't and some look like they are throwing easy when they are really bringing it. The same goes for fielders. The player may just look like he's throwing harder from the outfield.

If the zip is really there from 3b and the outfield you need to simplify the motion and get him to throw to the plate like an infielder/catcher and see if the speed is there.