Tardy, I cant ride any more this board, that's too puffy under my front foot where I step most of the time waiting for waves. Yes, was in hurry packing my 2 boards with 2 paddles and a pack of fishing rods



and the mountain bike in an other pack



. Finally I have been ready to be pick up by the taxi to the airport...but forget to unscrew that vent.
Opposite of what did happen to you, the skin really release from the EPS core. Next same board which I'm going to build soon will be with a primer coat before laminating with 4 to 6 oz layers of glass or carbon patches. The primer coat apply straight on foam is very souple so it will stick together the foam and the laminate fiberglass. This is a real reinforcement .
Steve, I understand how much you worry about your board without unscrewed the air vent. Your finally safe experience make me think that de-laminate happens on used board areas like the foot print ones.
So this incident forces me to Update my old favorite" BadBoard"