What you need is a correct diagnosis. If your white tongue responds to antifungals then it is 100% certain to be Candida. Then you know what you need to treat. Why start all sorts of supplements before you know what the problem is? You have already admitted to a partial response to Biotene, which although not conclusive, is indicative of Candida. Try some other antifungals. Find out for sure whether your white tongue is Candida or not. Otherwise you can spend years treating the wrong thing.
I am so glad I tried lots of antifungals when I had a really bad white tongue. It was a great window of opportunity. I hardly have any tongue whiteness left now, so am no longer able to do such tests.