I have severe ringing and have tried many things (not Ring Stop though).
I think I have cochlear damage in my ears. I've been told that by both western and non-western practitioners. I'd cut off my right arm to make the ringing stop.
Please report back if this works for you. I'm trying acupuncture right now too.
I'm sure you've seen this forum? If not, please read it through. There are some pretty desperate people on there...including myself.