shaft

I wouldn't recommend guessing on a $150+ shaft included with a driver just south of $500. In my case, I have the A-flex 65 g in AP1s, but due to how I load the driver, I have the Stiff flex in the 50 g M+ shaft on a 917 D2. And gained 20 yards over using the 60 g S+ in R flex. Each of us is different. You can use the A-flex as a starting point with a good fitter.

Make sure you visit a Titleist staff professional and get fit. They will get you in the right shaft

I'd reconsider drivers are 45" as you probably know is the longest club in your bag. means higher club head speeds also depends on the weight of the shaft. Head to a local golf shop for a fitting. Try the bassera 52g reg. Hope this helps