Driver shaft too light?
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In my old driver, the Titleist 913D had a 65g shaft in it. It wasn't a good shaft for me.
So I sold the driver, and got the Callaway Big Bertha with the Fubuki stiff shaft is 59g. Its much easier and smoother for me, really like the lighter shaft now. I have no problems controlling it.
btw, my driver swing speed is around 100.
My teacher told me I had the worst possible driver for my swing. I had the lightest shaft made at the time. The TM Superfast. I hit the ball super high and it dropped like a 9 iron. He told me it was because of the light shaft.
I now have a Bio Cell + and my trajectory is great and actually get good roll.
Weight is just part of the specs. I didn't really start until feeling in control of the driver, and only reasonably so, until I was fit and we looked at what shaft characteristics works best for me. The only reason I don't use a lighter shaft in my driver is with it being short I needed to get the swing weight up, I don't like lead tape and my heads don't have a port. With 10g in the tip I managed to get it to D0.