I think this is the question to answer, and then find a shaft profile that matches your swing. I'm a smooth transition swinger, and the HZRDUS Smoke Yellow and I just didn't get along. If I swung aggressively, I could hit a few really, really well. But, I also had a 2 way miss, and pulled a lot of shots left. It felt like it had no kick with my swing.Are you an aggressive or smooth transition player?
Now I play the HZRDUS Smoke RDX Blue, and it feels more flexible, and it really had fit my swing well thus far. Both Stiff 6.0, but different flex profiles.