Titleist Ap2 Pros And Cons I Am Buying A Set Of Titleist AP2 Irons And Dont Know What Shaft To Get?

I am buying a set of Titleist AP2 Irons and dont know what shaft to get? - titleist ap2 pros and cons

I am in limbo between 5.5 and Project X 6.0 shaft. I hit my 9 iron 142 meters around 8 on my 155 and my seven at 170-175. I hit the ball very high at the moment, and I want a little lower trajectory. any advice would be great. Thanks