There is a reason Titleist offers so many shafts, including no upcharge options at fittings. The stock shafts for retail rack sales only fit a relatively small % of golfers. Comparing rack models doesn’t begin to delve into the potential of any OEM’s, not just Titleist.
At 74 and LH, of my full Titleist bag, not one club can be found in the rack models. If there is even a LH in stock. By design and necessity, I get fit for everything.

Currently gaming the T-150's with the 6.0 PX LZ stock shafts. When I got them, I wasn't keen on buying off the rack and fully intended to replace the shafts with some Steel Fiber 110 CW's that I have. Funny enough, when I hit the course before the reshafting ever was to happen, I found the LZ's in that club to be so easy to hit and the playability, for me, was shocking.

I tend to like lighter than 120 shafts too, but these just work. I would tell you if you aren gaming the 100's that you may want to consider the Modus 115 shafts. The 105's are good shafts too, but I think the 115's are like the best of both worlds.

Good luck.

The PX LZ 6.0 shafts are 120g mid-launch as are the Modus 105. The AMT White are billed as the lowest trajectory and lowest spin of all the True Temper shafts. Maybe you should try the Modus 3 to see if that helps with the ball flight? I use Modus 3 120s which are high launch in my T100S and they’re very consistent

AMT White are the lowest launching and spinning shafts made by True Temper. Try the Modus 105, its higher launching and only weights 106.5g.