Hmm. I'm not really suggesting any particular kind of diet. I'm simply suggesting to see if directly addressing apparent mucus overproduction might help that particular symptom. Obviously you have candida overgrowth and other issues (presumably), but sometimes we have to deal with other "side" problems while we're pursuing these larger problems.
As far as your candida issues, for many antifungals and diet are not enough. In fact, sometimes doing an anti-candida diet and antifungals for too long can actually be regressive in my experience. We can tackle that as well, but we'd need to know the diet and protocol you used.
The bottom line is that the body is a powerful living system that is created to sustain and repair itself in ways that we still don't fully comprehend. Don't ever forget that. Sometimes we have to help our bodies do what it needs to do, but it can be difficult to figure that out. That's what this board is for. =-)