I have an 02 SSV which has a similar hull to yours and we set up the boat as follows:
GG 565# sac in the port locker (plus I have the two batteries at the back of that locker)
750# sac half on the port seat and half up onto the rear deck
GG 1180# sac in the ski locker
250# sac on top of the seat between the windsheid.
The sweet spot is really long with the extra weight in the middle of the boat.
We have found that if you put the 750# sac on the side seat without half of it propped up onto the rear platform the wake is not as good. Having someone sit at the back with their feet on the platform really helps. Check out this video with the ballast as above, a 130# driver and another 130# film girl with a 200# guy on the back corner of the platform. http://www.youtube.com/watch?v=yF68SVP2yDs