I believe the Shaving ie and Maggard websites only sell the 2013 R41 heads. You can get a 3D printed 2011 R41 top cap (called Hurricane) which makes your R41 2013 behave like the more aggressive 2011 version. I found this advice on a thread but I am not sure yet if the 3D printed version is any more aggressive than my 2013 cap.
Hey, thanks guys. Appreciate the recommendations. Fortunately, found a 2011 head at a reasonable price. On it's way. Really looking forward to giving it a whirl!