The big difference is the variables, the Action-boo will be very close to the same each and every time. The natural woods can vary a lot, the next board of Maple or Elm can be 50% heavier and not nearly as stiff.

Excellent point Jason!!

Now you got me wantin to take a slice out of several red elm boards and test again!!

 

Things change quite a bit when you laminate a stack of them together though!  

Kenny, you need to test a couple test limbs of the two most extreme.  I think the differences would shrink quite a bit after sandwiching four of them between glass.