By all accounts the new 913 drivers sound like they will be great and i am keen to try one out.
I am a 15 h/capper that on occasions suffer from a bit of a slice. I have always been fitted with a stiff shaft (currently using G20 with the stock s shaft). I expect the 913D2 head will be most suitable, but what shaft is likely to be best, given i hope to reduce side spin and am seeking a mid height trajectory