As far as the height comparison between the HD and KW, I have no clue. I ran the stock windshield for the 100 miles on the way home from the dealer and tossed it in the trash.
As for the klockwerks rubbing, I have the 8" KW on my bike and have no rub/wear marks what so ever. At first I installed the rubber trim on the bottom but that didn't even last long enough to install all five screws
hated the look. But that's just me, and I'm off a tick or two anyway
I have just about 5K miles on the bike and windshield and no whistling or rub marks. I'd say find the height KW your looking for and enjoy the miles spent being it