I’m using the Fujikura Motore X F3 6S swinging around 100. Very stable and helps launch the Stealth plus a bit higher as I wanted. Also using it in my Radspeed 3 wood. This shaft doesn’t feel boardy at all and you can feel the smooth kick. Tried the Taylormade Ventus 5S but didn’t care for the consistency as much as the Motore X but, this was not the Velacore model and also lighter. Originally was using the Kaili white 6S which was also a great feel but launched lower.