What I found with our 2000 SeaRay 19' b.r. with 5.0L.is that the wake shape is better and cleaner with 400 to 800lbs in the ski locker and the bow walkway.I sometimes would also put one Sac on the Starboard side to balance the wake. It's No Inboard but it works for now.
I have extra FatSacs and pump that I will let go cheap if you want to experiment.