I am currently running a keywest with a700 bb on 8 cells with a x447 prop on it I went to 12 cells and it would just spin the prop and finnaly plane out but was not much faster than the 8 cell pack I was running in it before wondering if anyone had any ideas on what prop I should use or if this is too much weight for the keywest it did sit awfully low in the water even on plane it had too much wetted surface to suit me any help would be nice