i have a 2011 10m c4 aswell on a modified 2008 bar
have not noticed the extra bar pressure yet ?
have also flown 2008 sport II 11m and 9m , light II 14m
never flown an edge but really want to .
will try them on the same bar and im sure i will feel it then
or maybe just heavy handed ?
the 8m c4 2013 felt like ''home'' yesterday very happy

and have made the right choice