I think I have finally found the perfect wake setup on my '08 Sunsport with the 750 LB rear sacs. I was told by a fellow Supra owner who I met on the lake about this combination and it put a perfect wave out.
Just fill the rear drivers side sac, do not use the front ballast. Set your wake plate all the way up and set the PP to 10.2 mph with a couple people sitting in the love seat. I noticed on the passenger side we had to increase the speed to 10.8 and put the wakeplate at 1/4 down to get a good curl, must be because the way the prop turns.
Regardless, we had riders on both sides of the wake surfing with no ropes. If you are looking for a different setup might want to give it a try. Again, I dont have the stock 400 lb sacs, not sure how it would work with that weight.