That is interesting. I have the tallest, dark tint Clearview recurve shield (16"), mounted all the way up. I have slotted the holes extra to get a little more height out of it. I'm only about 5'10" and sit on a Mustang seat (1" lower than stock). And I see well over the shield.
So maybe it is something that you can get used to. I see things through the shield, but they are not in my concentrated view. The area that I want to watch is above the shield.