Water in the boat

I finally got a decent wake, but nothing to brag about, out of my 04 Centurion Lightning with 1750lbs of ballast and 3ppl in boat and one surfing. Problem I'm having is I'm taking in water through my blower vent on the port side while slowing down for a down rider. I really want to put more weight in to get a better wake, but scared of taking more water on. Any suggestions? What's the best way to cover the vent to prevent while surfing?