i know this depends on a lot on factors, but i have been seriously confused by this lately. i had a nike 9.5 driver with a stock stiff shaft and was hitting it super high. got an 8.5 adams fast 12 ls driver with a low-launch stiffer shaft (grafalloy prolaunch red) and i seem to be hitting the club at exactly the same height as the 9.5 driver, with just less spin.
i don't know what my angle of attack is, but i would think it would have to be pretty positive to get serious height? i have a 105 SS with a 12-13 degree launch angle and usually carry the ball about 240. i usually hit the ball in the center of the driver, maybe slightly below center. as far as how high the ball goes in the air, the best reference i have is about the height of the fences at driving ranges, probably 10-20 feet higher. i know those fences aren't all the same height, but i would assume they are pretty close everywhere and that might give you some insight as to how high my ball flight goes.
it feels too high to me, but i don't really know what i'm basing that on... also the 12-13 launch angle is probably optimal, but that also was some time ago on a LM, so numbers may have changed a bit. thanks for any input.