Wouldn't using the lighter e-shaft in some sense hurt your search for low end grunt? Only in the sense that recipricating mass = torque in general.( Not sure if top end is the more focused goal range) Now we are only talking about .41 lbs, but you were anal enough to go this far

Just curious, or do the 9.7's overcome any loss of mass due to the e-shaft.
Good info all around.
Dave