You might also consider the ball. ProV1x might also help.

I have two sets of clubs. I used a TS2 driver with both sets, and needed a new set of clubs. I am very consistent with my TS2. I am an 11 index, and driver swing speed is about 102. My TS2 is an 11.5 degree loft. My pro ran all of the metrics at my fitting. I was more consistent with the GT2 vs the GT3, but when I was able to get the ball “centered” on the GT3, “the numbers” were better. The GT2 is more forgiving across the face of the club. We made a joint decision to go with the GT3, understanding that there would be a learning curve. I struggled my first two rounds, needing to adjust the loft (which was 10 degrees), as well as the weighting between the heel and the toe. My first two rounds, I had 5 and 6 penalties on drives, and was very frustrated. I went back to the pro, and we hit 75 balls on the range, using trackman. We adjusted the driver to a C-1 (I am lefty), and adjusted the weighting to neutral. I have since played 3 rounds without hitting a ball out of bounds, and the dispersion is relatively minimal. The ball flight is lower than the TS2, but the distance is greater. My personal view, is that if one is willing to “work at it,” the GT3 is a really good driver!