Sorry to hear that you havent had much luck so far.
I think it's difficult because we have a complicated illness, as you know and doctors specializing in ME/CFS tend to focus on the area they prefer (for a variety of reasons), but the majority are likely looking in the wrong area, and even if you have the right area, there is still a lot of hit and miss because there is a lot we dont know.
Unfortunately, getting competent people to work together on something like this is generally very difficult, especially people from different areas of expertise and the more people you add to the group the harder it gets to direct. It's easier if you have one very good leader with a broad range of skills and experience, and can offer the right incentives to motivate a team of people like this, but thats not an easy situation to construct in situations like this.
I think you can improve your chances by directing things yourself as much as you can, try and steer your treatment in the direction you think is most likely to give results, but this relys on you being able to do a lot of your own homework and focus on the facts as they relate to you specifically. And of course, a bit of luck wouldnt hurt, so i hope you get some soon.