I tend to deloft due to lag so I am looking for higher ball flight in mid and long irons and lower flight in wedges. I also prefer a higher swingweight club so that I can feel the head throughout the swing, wedges are very head heavy.
You might look at a shaft like the KBS Tour FLT Chrome (FS0042) which is a flighted shaft design. It is designed to create a lower trajectory for the 7 iron down and a higher trajectory for the mid and long irons. The S+ or X flex based on your 9 iron carry distance and moderate quick tempo could be a good choice.