My first ballast set up

Hey everybody,
I am riding behind my 96 centurion LaPoint Elite V-Drive. Up until this point I have been running 600 lbs total sand ballast in my rear lockers and about 300lbs of sand up front. I keep a sand bag handy in the seating area to move around and correct things on the fly. Not an ideal set up i know, but i am operating on a budget. Wake is ok, and i know this is not the best hull ever built, but it is time to step it up a little.
I just bought a set of 400lb each fat sacs for the rear lockers, that is all it looked like I could comfortably fit, so I am planning on running 800 in the lockers and 400 lbs of sand up front to see how it works. I usually ride at 20-22 mph and the kids ride 18-20mph.
Anybody out there have experience with this boat? Am I on the right track with the 2 to 1 back to front weight ratio. Also my front weight is 100 under spotter seat, 100 on floor in front of driver, and will be running 200 either on or under front seats. Any thoughts?