The split grip has worked for me but I would not recommend it to anyone else unless all other grips failed for you. If you do the drills that Scott teaches in the IMA video and still cant hit the ball well then maybe you could try the split grip. Scott does say in the video that the grip may be separated if you like interlocked or reverse overlapped. He never says that a standard overlap is OK. My hands get closer together at times and sometimes my grip is simply a standard ten-finger grip but if I start to hook the ball I always go back to the split grip.
My advice is to get the IMA video, do the drills and then experiment until you can hit the ball the way you want.