UST mamayia has hit a home run with the Recoil Iron shaft.
The shaft comes in three varieties, the aftermarket model which you can know find in Callaways and other OEMs as standard inserts. The Prototype model which a lower torque profile for the stronger golfer and the tourspx model which only a few clubmakers can obtain. This shaft can give the best of both worlds. Frequency matched, flight and torque for all your needs. See the info in the video below.