Same exact thing happened to me. I would take 240mg of methadone in the morning, and another 140mg in the early evening, yet I'd still wake up the next morning with withdrawal symptoms (feeling cold, uncomfortable, etc). I'd take my methadone immediately when I woke up in the morning and just had to sort of sit there in discomfort for an hour and half waiting to feel better. Which is crazy since 380mg/day of methadone is a shitload of methadone.
As far as how I got off, I just tapered very slowly. Exercising everyday really helped. Also taking hot baths daily helped with the aches and pain of the withdrawal (the relief sort of lasts a while after you get out).
The process wasn't too bad. But took a long time (particularly since my dose was so high). I got readdicted to opioids a few times after I got off of methadone, but never to that same level. These days I take opioids pretty rarely, like 1x a month a most. Back when I was on 380mg/day of methadone everyone assumed I'd be on it for life, since that is a "lifer" type dose.
So at 85mg/day, there is definitely alot of hope in your situation, but you have to be ready to get off of opioids. But if you're not, then don't rush it. I definitely don't think it would have worked well for me at all if I hadn't been exercising. Thing is, that worked well for me because I enjoy exercising, so if that was never your thing, then if can be harder. Also, as a male, due to much higher levels of testosterone and lower amounts of body fat, the visible results of exercising occur more quickly than they do for females, which can definitely make exercise seem less appealing. Still, its the only way I was able to get off methadone fairly quickly and smoothly. I think it could work for a female potentially.