Other than hitting up on the ball (it is the most significant factor, I know), what would be the best way to adjust a driver so as to increase the height trajectory of the ball while keeping the spin as low as possible? Using a more flexible shaft but lowering the loft of the head, or using a stiffer shaft but increasing the loft of the head?
Here is a trick I use. I purchase SKU: CIV swing weight corks. Here is what I do, place the corks down the shaft at various lengths until you change the EL character of the shaft to achieve what you are looking for. This will take a while to do. I would cut the corks so they go down every 3″ it may take 2 or more corks. You are basically changing the shaft dynamics to lower you spin rate by stiffing the Butt, mid and tip to use lower degree club heads. Using the TOUR LOCK product SKU: TLPPLUS will change the shaft dynamics as well, however you can’t adjust them like you can the cork. Once you have the desired depth, epoxy the cork in. You will need a SKU: RR5 shaft rod to remove and install the cork as well. ( I think that’s the rod with the tapered/smaller end. Hope this helps.
I think you have to experiment with both options to determine which one does it for you. Your attack angle, your clubhead speed, etc. can influence the results. I have seen the stiffer shaft more loft work for some, and the more flexible shaft lesser loft work for others. For me personally, although my speed indicates I should play an X, I play a lighter weight (56 gram) S flex with an 8 degree driver. That gives me the launch window and spin that works for me in my current state. I have tried more loft with stiffer shafts and if the cg of the head is in a position that helps keep the ball down, I can generally get to the launch angle I like, but the spin is still higher. So, I have tended to stick with the slightly more flexible, lighter shaft and the lesser loft. Again, I think you will need to experiment with both to see what works best for you.