Tinker
You're right that many players would benefit from a higher trajectory on their drives. Many, MANY players are playing far too little loft on their drivers. They would benefit from going to a 12.0 to 14 degree driver. In fact, many slow SS players should be playing 16 degree drivers (a "ladies" driver) or a 3W off the tee (this is the only reason that most people should even carry a 3W). HOWEVER, a higher trajectory does not necessarily result in longer carry; you need the right trajectory for your ball speed.
If you are swinging a 44-45" driver at a 105 miles an hour AND hitting the centre of the club, you should be hitting a 9-10 degree driver (a generalization, of course, but not a bad one). However, if you are missing the CG, the shorter driver might help you hit the centre of the club. You may lose 6-8 MPH, meaning that you would swing around 97-99 MPH, but you would just loft up to a 10.5 degree to get the same distance. Similarly, if you swing a 44-45 degree driver
- 100 MPH, missing the centre, you will hit the shorter driver 92-94 MPH -- hit the 12.5 degree
- 95 MPH, missing centre, you will hit the shorter driver 87-89 MPH -- hit the 14 degree
In all of these cases, you will probably hit the shorter driver farther because you hit the centre of the club, increasing ball speed.
This scenario potentially gets even better! Machines lose swing speed with shorter driver shaft lengths, but we're not machines. Many people find that they lose very little swing speed because they can control the club better. In fact, many people find that they can actually swing the shorter, heavier driver FASTER. They not only benefit from the on-centre hit, but the faster swing speed -- big gains! The same can be said for FWs.