So in my opinion there is no problem with testosterone. In most PFS-Cases blood serum testosterone is normal, thats why so many doctors have difficulties to acknowledge a problem. I think there has to be a problem with neurosteroids-levels or balance or even neurotransmitters. Thats why adding androgens to the system wont have any effect. The neuro-endocrine system isnt fully understood yet.
My second quess is that it has something to do with the gut. Maybe finasteride changed the microbiome in a way that fucks up the hormonal or neurotransmitter balance in the brain via bain-gut-axis.
From everything I tried the only thing that has worked were supplements/medication that influence neurotransmitters and the gut. So essentially antibiotics like penicillin, precursor like 5HTP, L-Dopa, L-tyrosine, l-lysin, choline and stimulants like amphetamines or methylphenidat.
This is has been the most stable improvement since three years. If I now have a crash, which happens rarely it goes away in 1-2 days. The only thing I take are stimulants, nothing else, only multivitamin supplements.