I really wish I was better at doing the math myself, it really seems to me that SS would be a bit better than most findings show considering they also affect your DoTs which with Crit as a main focus should theoretically boost how many procs you get and thus your overall damage. Looking like it doesnt matter so much right now though since DH is such an easy choice and a lot of the crit focused gear right now typically carries enough SS to break you into a decent enough range without prioritizing it.