RE: Pinholes & Airbubbles
I have found a couple of reasons for pinholes. (I'm sure there are many more) Mainly that the bleed was not controlled, so the finished layup is a little too dry, the other is the resin system. People say that Pro Set will bubble at anything over 13 inches. Why, I don't know, but it does!
If you have a vacuum system, you can make a vacuum chamber and boil out the air bubbles in the resin before laying up. Thats a little radical and takes a special touch.
For a experiment, I would layup the cloth on thin plastic, then put another layer of plastic on top of the layup and squeegee, you should see any areas that are dry. Pull the plastic and place on your prep'ed surface and put waxed paper over top ( the waxed paper must extend past the layup), then bag as normal and pull full vac.
Let me know how that turns out, we can work from there.