Replying to Anyone have experience putting ballast in a boat for wakeboarding?

So I got a job recently, and have some money and want to get more fat sacs for my boat. We have Mastercraft Prostar 205 (its direct drive, not V drive), 1994 i think. Anyways currently all we have is one 650lb fat sac that we put were the rear seat would be but could be moved to anywhere else if it needs to.

I was just wondering if i have about $350, possibly more if my parents chip in, what size bags should i be looking at and were should we place them in the boat to get a really nice, large, hittable wake? Also Id like it so if we rearranged them we could use them for wake surfing.

Also, If anyone has the Fat seat ( the one with the arms that wrap around the engine housing) can you some how fold one arm under so only the port side fills for surfing?

I realize that most of you wont be able to answer this but I don't have an account at any wakeboard websites so i thought it Id atleast try here first.