With the size of your boat and the amount of weight you can add i would just build a suck gate. we just built one for my buddies 05 xlv moomba and with both rear 1100 bags half full and his center locker half full the wave was spectacular. I used the mission delta on my boat with both rear 750's full and the wave was great but it worked the engine to hard for my taste.
All of my systems were before the suck gate and i love the tab system that i eventually settled on. It does require a bit more weight but it is easier on the engine. I also think that if i had to do it all over again i would probably do a suck gate and not fill my bags quite as much.
My recomendation is buy some suction cups and a cuting board and start building a gate.
Function before fashion!
I forgot to add that 5x9 was the most you needed to get the gate to work. One other tip is to tie it to your tower with the tab side facing forward and use a clay bar to remove wax or lake slime from where it sits. This will help to eliminate the gate from sliding off the boat.
Function before fashion!