I think my main problem is that I'm very allergic to yeast. I may not have a huge amount of yeast breeding in my gut due to my low carb diet, but I'm sure I have it burrowing deep into my bowel walls. I have tested my bowel for permeability and I have a very leaky gut! I'm sure candida is responsible.
On a low carb diet I suspect it's possible to have minimal free Candida yeast within the bowel contents, yet have very damaging fungal Candida eating into the bowel walls. This might explain Candida negatives on CDSA and organic acid tests. The antibody Candida Immune Complexes test Jorge refers to might be superior in picking up on fungal Candida.