Go a bit lower?
The options in the US are limited as far as tapering with opiates goes.
You have the options of methadone and buprenorphine, legally speaking.
You can get any other drug you want (not necessary legal in the US though) to help come off of buprenorphine. However, more buprenorphine - or methadone, are essentially it.
There are other approaches to ORT, but not many would be better suited for the job other than buprenorphine.
I would suggest to taper even lower - to about 0.25mg or 0.2mg per dose (0.2mg each dose which would be 40 piles from a 8mg pill) - this should help out.
Another suggestion is to acquire any short acting opiates you can which you know you won't have a problem with taking (I don't have a problem with any other opiate other than heroin - hence I can take hydrocodone or codeine and not feel any need to repeat the experience) - this can help.
You can also try out benzos, or weed, whatever really does it for you. However, these last 2 suggestions aren't a "legal alternative" like Suboxone or Methadone are.
If you want to move to the UK; they have approved dihydrocodeine (DHC) for ORT either by itself or alongside MMT (methadone maintenance therapy), so that is a legal option for UK residents. From what I heard from BL'ers from the UK, it's kind of hard to get from a doctor for the purpose of tapering - but some have managed to get it.
I'm sorry the law hasn't caught up to practicality in any sense of the word.