Short, Powerful Backswing: So What's The Best Shaft for Me?
Short backswings with strong acceleration do require more overall stiffness and/or more tip stiffness to prevent a sudden, forceful swing move from over bending the shaft at the start of the downswing.
When choosing the right shaft, the weight of the shaft, the overall flex and the bend profile are the most important elements, with torque being much less important. The reason is because you just do not see higher torque with any shafts that are designed in a stiffer overall flex with more tip stiffness. The shaft companies know that players who need to use stiffer overall flex shafts and more tip stiff shafts also need to keep the torque no higher than 3.5*. So it is very rare in the industry these days to even see a normal S, a strong S or any X flex with tip stiff bend profile to ever have a torque higher than 4*.
In addition, as long as the overall flex and bend profile and weight of the shaft are correct for a golfer’s swing, the difference between a torque of say, 2* and 3.5* is very minimal on shot dispersion. The golfer might notice that the 2* torque shaft felt a little stiffer at impact than the 3.5* torque version of the same flex and bend profile shaft, but he would not experience anything in the way of off line shots from a 1.5* torque difference.
So do your best to get fit for the right shaft weight, shaft overall flex and bend profile for your swing moves and the torque is not going to be an issue.
The best way to be sure you are properly fit for the right shafts that match all your swing characteristics is to find a GOOD clubmaker/clubfitter in your area and have them use their knowledge and experience to custom fit you.