I'm not sure why you feel like a fraud going to Al-Anon, you went there because someone you love and care is an alcoholic and it is affecting your life. They say you should try it at least 6 times to see if Al-Anon will be of benefit.
One other thing, with an alcoholic, their best friend in the world is their drink of choice, everything else is secondary. As long as your friend keeps drinking, it will stay 90/10 as you say, which is a pretty good ratio at this point, but be prepared for it to go to 100/0 if he continues to drink.
I hate to be a bummer, but just basing it on years of experience in dealing with AF and AS. The hootch always comes first, over family, friends, and their health.
Welcome to the board and read the stories of many who are/have walked in your shoes in dealing with someone they love with is an alcoholic. Go to Al-Anon, it does help and it took me a while to accept that, but it does!