Hey brother, I was on the 'done for years, and ended up on a high dosage of 500mg a day.
It took me a long time of reducing by 5 mgs a day. If after a few weeks you feel better, drop it. If you don't. stay where you are.
Once you are at 15, drop by 1 or two.
Dude, I can't lie, it wasn't easy, and I hurt for quite awhile, but I've been drug free for 20 years thanks to methadone.
Cheers and good luck.