So here is an interesting curve ball to chuck into this one.
I have two butterfly bats made by B3 and Hunts. I also have a custom GM made in Robertsbridge by, I believe, a mr Chris King. What all of these bats have in common (I understand from the manufacturers) is pressing specific for the cleft, and all go really, really well, to the extent that people all comment on this aspect when they are used.
What this suggests to me is that if you can press to a pattern, I.e. optimally for each cleft, then you can get the beat out of each and every cleft. There is one issue with this, and that is that to do this consumes time that isn't available when mass producing.
I fully understand where the Doc is coming from on this. If you can determine a pattern for how willow should be pressed then you can guarantee, within bounds, what the performance should be. Whilst each cleft *is* different, the overall variability of a selection of clefts is likely to follow a normal distribution which will make it much more straightforward to identify patterns amongst cleft characteristics.
David, I'm happy to play guinea pig in any sort of blind tests you are considering setting up. I think I get the theory and I look forward to seeing what you come up with.
I don't think achieving your aim will be your biggest issue. I think overcoming a sceptical public that has been sold "performance grading" for a number of years by a wide range of batmakers will be your biggest challenge!