Hey [MENTION=9990]elairiffic[/MENTION], how's Bert doing?
I agree with the others, maybe that is a little too much bathing - I understand if he is hot and humid, maybe just do a rinse instead of using shampoo every time? For his folds - I know too what you mean. Red, raw and "hairless". So: for diet, I feed hypoallergenic hydrolyzed prescription food. Here is Canada it is only through the vet. I learned that my guys are allergic to all protein and starch. They can't have any animal products, so their food is actually a hydrolyzed soy protein.
They are almost 3, and this has made a world of difference. However, they still get some issues in their folds. I clean them 2 or 3 times a week, with a mild germicide (like malacetic, diluted). I dry and sometimes follow with "panalog", this is prescription topical steroid. It is important to minimize the use of steroids as much as possible, even topical ones. But, this keeps the major redness and hair loss under control. Maybe see your vet, and ask about possibilities. *I am not a vet, and I don't know your specific issues, but this is just what seems to work for me. good luck!!!!