If he's already a PW, it's too late.
Another vote for MassCrease. Great teachers and very nice people as well. Good perspective. My kid loves going there.
Mass crease is great if your sperm sucks.
Masscrease. Nationally respected and connected. They do not have a cookie cutter approach, not a goalie factory, recognizing that lot of goalies are built differently. They will work on making the most of your strengths and work around your limitations if any. At the peewee level - teaching great fundamentals.