I can see that the existence of the cups1311 and cups extensions and their different deps and different "raison d'etre" is causing some grief.
I believe that one of the ideas behind the cups1311 extension (and thus foomatic-rip, which is not required for a lot of/most/all printer drivers using the cups extension) was that the user did not need to be root to perform some of the tasks - this probably explains why there seems to be a permissions issue.
As I recall, the foomatic-rip extension required libgs_ps (as opposed to libgs), is it loaded?
Things may work with libgs, but you'll probably need a symlink /usr/local/lib/libgs.so.8 -> libgs.so.9