Weight me!

2000 centurion air warrior elite v-drive.

Factory 480lb ballast ( 25 gallon center ballast + full 35 gal tank of gas = 480lbs) kinda sounds like false advertisement huh? anyway...

Im looking to add some weight to this boat. I have a set of the fly high 42 X 16 X 16 (800lbs total capacity) v-drive sacs on their way. With full ballasts the boat will have 800 in the rear, 400 in the center, and nothing in the front....unless i put people up there.

Im looking to fill these tanks separately. I have a fill/empty switch for each sac. I am going to get a pump (jabsco or simer.... undecided right now) for each sac. I am NOT building a manifold. This is because if in the future I want to put a sac under the bow seats, I will put the rear bags on one pump and one switch (will lose separate filling/emptying capability). Then the front bow sac will use my left over pump and switch. I would really hate to do that though. I want to keep that storage space.

Question is to you guys out there....What have some of you done with a similar setup to mine? Am I weighting this correctly?