Chad,
Nobody has answered, so I'll take a stab at it. I believe the footing process stiffens the shaft at the front much as laminated wood is more resistant to bending. This in effect changes the bending modulus nodes to the rear of the arrow, thereby effectively shortening the working part of the shaft substantially, which in turn allows the same spine cedar shaft to be used, even though quite a bit of weight has been added to the front of the arrow. Make sense to you? Anyway, just my opinion, I could be wrong. Hope to see you at the Ky Klassic in April, I can hardly wait.

Best regards,
Darrel