after reading many posts, how to's, etc, I adjusted the lift cables when I got home from camping this weekend. What a difference it makes to have the top half all the way up!! It was sitting about 2.5" low. The bottom curtain rods are now accessible without pinching fingers. the seal actually seals! Before it was adjusted, I liked using the shower because it made me feel tall, because my head hit hit the ceiling. Now, i just feel short again.
thanks again to the forum for your experience and insight on these matters!