Eastcoastballs

I have a spider female about 1300 grams and pastel male 1400 grams both displays UR infection symptoms. I have now seen 2 different vets and so far they have not been able to help one is pretty well know as a herp vet in jax,fl it has been a year now and it seems to come and go. In there mouth is a gooey thick and stringy mucus they have been treated with 2 types of antibiotics and nothing seems to work. i personally dont think it is UR infection does anyone know of any cases like this or thoughts on what it could be. the female spider even has saliva rush out of her mouth some times when i pick her up.