Just get your gastrointestinal tract checked already. Start with abdominal ultrasound, gastroscopy, colonoscopy. Test your bile acids, amilase, lipase.
I'm sure the answer is hidden somewhere there. You could also try 1 tablet of UDCA to thin your bile a bit and see how it effect your health. Pancreatic enzymes and probiotics could also help with digestion.
I think that your case most definitely has to do with DHT inactivation. Your 3α-diol (which is a low-active form of DHT) is super low, which might mean that your DHT breaks down into it very poorly and instead accumulates in blood. Could be AKR1C2 defficiency caused by bile acids accumulation or smth like that. And bile acids are very dependent on the state of gastrointestinal tract in general.