My speed is 77 and it worked great for me with the 35 gram Speeder shaft.

Either the TS-2 or TS-1 would be significant improvements over the 913 driver. The sweet spot is substantially larger and the head materials are designed to increase the MOI. Each person has a different swing. Your swing speed is the target range for a TS-1, but getting optimal performance will best be done by a full driver fitting. For the price of a new driver, a fitting is the insurance policy to get the most out of the driver. Even in the TS-1, the two shafts are different enough that weight alone is not the deciding factor. I still have a TS-2, but prefer the TS-1 as the lighter weight is easier to keep on tempo.