I love the shaft 4!
Have found, and will be testing more in a tournament this weekend, that my dye cf boomstick back with my stifi tip seems to be the best set up.
Got a weight bennift, with a nice 6inch control bore, and a very light tip.
Marker feels balanced, "pointy" and shots are very consistant leading to NICE "accuracy".
The set up idea came from the bennifts i experienced from the control bore on the shaft 4.