I hear you!
I have not lost any weight since September and have not changed dress size since December. It is frustrating and fasting does not seem to make a difference anymore.
Reading your story I have often wondered what would happen if you stopped exercising completely for 6 weeks I am sure it is unimagineable.
I still also do not understand how you can exercise for hours a day on 1700 calories and not lose weight but then I ate nothing for days recently and did not lose weight (well I did but it was not much and it came right back). I am at a set point that my body has decided to defend, not sure why it chose this one but there seems to be nothing I can do. I am a little stressed, not because of exercise but because of minor anxiety related to daily life that I am worried about. I have wondered if I start exercising again for relaxation rather than to lose weight whether that will help.
What about the Ted Naiman high protein protocol? Jimmy Moore on the Keto Hacking MD podcast tried it recently. He did not feel good on it but it does seem to encourage weight loss.
I agree with the other posters that you should consult the people running your program to see if they have any ideas