Your problem probably is not too much vacuum. It more likely has much more to do with your bagging schedule (peel/bleed/barrier/breathe, etc). You mostly have to figure out where the resin that you want in the part is going - then stop it from going there.

I build skis and snowboards. I made a similar mistake once by confusing the roles of the bleed ply and the breathe ply. Many of the books out there blur these definitions, and many use them interchangeably. On that fateful day I laid up a board covered it with peel ply, Breathe ply, and bagged it. The breathe ply ended up good and rigid. The board was really light as the resin all ended up in the breathe. Doh. Board broke immediately.

Questions. Did you use a barrier ply and a breathe? Where did the resin end up? In the hose?

More information will help.

Good luck, Carl