I just tested the 915H and I have a question about getting a different shaft for the club. I tried both the Aldila Rogue Black and the Diamana S+ Blue 70. The Rogue shaft felt a lot firmer to me than the Diamana which I didn't like, but I prefer a heavier weight so I was thinking about getting the Diamana S+80 shaft. I can't test that shaft so my question is should the 80 feel like the 70 or will the extra weight make it feel firmer ?