If it is the pro setup, 2300 lbs of ballast, fill up surf corner all the way, and maybe add the sacs to surf side like you did, fill up front on surf side, and then fill up the other side corner til you are about at 7 deg list at rest. Ours is being built, so we don't have tons of experience yet, but you cannot weight this boat like the RZ2. The RZ2 wants the rub rail buried, this boat doesn't like that much list, and it kinda goes against what you are probably used to, I know it did for me. Once we got it dialed, the wave was a great shape and according to RJ and Dennis had "ridiculous" amounts of push.
Once we get ours and play with it more, we will be able to give more feedback.
The RZ4 also needs weight on the opposite side, less list than the RZ2. Hope that helps.