I assumed that he couldn’t eat those you indicated which is why I reported back with those that the research that I did for you found. It sounds as though what he’s currently eating is still not working for him.
Have you ever considered an elimination diet? They’re not simple and require discipline, but are the only way to reliably get accurate information. Through an elimination diet, I’ve learned that my Golden can’t have fish (all fishes), including fish oils, flax, tomato, chickpeas or lentils.
Allergy tests are notorious for both false positives and false negatives. Historically, they’re unreliable.
