I only have a 10-mile "test ride" on my Dad's '13 WC, but I really didn't see any of these issues. I have plenty of experience with an '08 and '11 though.
For me at 6'2", the stock 2005-2012 GS (not GSA) windscreen is *horrible*. I'm not concerned about wind pressure, only noise. The stock 05-12 GS screen is the loudest thing I've ever experienced..it made my ears hurt on a store run at 50mph. Adding the GSA's screen solved my problem here. On the '13 WC, I found no such problem. My experience with windscreens is that they're entirely personal/subjective....I've had friends ride my bike with what I think is perfect wind protection and they think the opposite.
The narrowness and handling of the '13 are two things I like about it.
To each his own though, it sounds like you got the right bike for you. I'm extremely happy with my 11!
11 R1200GS TB, 09 FZ1