Wanted to get some thoughts before i pull the trigger on my ballast upgrade.

I got a 650 nose bag. Its a bag that goes under the bow seats. It has 3 fill locations. One on each leg and on center top of bag.

My plan is this.. Use the vent hole on the ski locker bag to plumb a line to the top of the bow sac. Then add drain pumps to both legs of the nose bag so it will drain. Will the bag be able to vent like this at all? I don't want it full of air.

Another option im thinking is ski locker bag to a leg of the nose bag for filling. Then use the other leg for draining and the top fill point as a vent line.

My concern is will the bag drain all the way with only a drain pump on one leg?