I love all the science but the truth is that despite the studies so far I can guarantee to produce a better bat by using experience in the making. I have had bats handmade for me by many, Millichamp, Laver, Keeley, Sains, Miller and many more but the first time I got told to have something other than my request was by David Banks at Stac. I told him what I wanted and even though he does not machine his bats and simply shapes and sands them like many of the custom bat makers here on the forum he taught me a lesson. He told me that with my size and the way I play my shots I was having the wrong shape and proceeded to make something else shape and weight wise. I was disgusted as I stood there watching my chosen cleft being hacked up but the resulting bat scored me more runs as I was hitting the ball better and further. I'm sure that the heavier weight and lower middle was the reason and the shape was much like the M&H Solution about 10+ years ago.
For all the shapes I've got my preferred ones for my style of batting.