I am putting 4 2.5 efi's on my 30' Chris cat, it is the race version so it weighs about 5k. I am looking for recommendations on how the hell to prop this thing. Same props across the board or different ones in the center. I do not even know where to start. How do you figure out potential top speed at 7800rpms on a boat with 4 motors? Anyone care to guess what kind of speed this thing will run? Thanks for the help.