I'm running exact same set up as drew and this past weekend we tied the boat at dock ballast fully loaded when we got back on boat 1.5 hours later the now sack was empty. So I flipped switch ran down to empty and refilled. Now the now sack seems to drain to about 1/2 while surfing. Any thoughts?

I checked all of the fittings on bow sack and hard tank (the 2 you can see if you remove the circular cover in floor). No leak. I also filled the bow sack in the boat on trailer and out of the boat in yard no leaks.

????