I have added DHT levels at trough in update 7, the company forgot to send them yesterday.
I've been running increased DHT levels for almost 6 weeks now and there have been no libido improvements. I think I can safely say that DHT won't fix my libido issues. Having hormonal fluctuation and now proper DHT levels has fixed around 15 symptoms and my body works better than ever. This is how a proper TRT protocol should feel like. All of these symptoms are minor, and having just 1 of them wouldn't be a big deal, but taking care of all of them is a huge improvement.
Obviously being on TRT I have smaller balls, less semen and it's also less thick. All of these things were far, far worse on Test E. Now that I have hormonal fluctuation I can say that it's still noticeable, but not nearly as much as before. My balls also don't ache as they did with Test E.
Obviously there is something wrong with an unknown factor regarding libido. I'd say it's very much possible that being in an androgen deprived state for multiple years has done some damage/changes to my body. I started TRT 8 years after getting acute symptoms of low T. Maybe long term androgen deprivation does similar things to the body as Finasteride/Accutane/SSRIs do, but not nearly as bad and maybe more localized.
I also think that DHT plays a vital role in the success of HCG. I have a good enough, but not high, natural conversion of T to DHT, but on injections the conversion usually gets lowered. So in a natural state I had a decent conversion and on injections I had a bad conversion. Now 1000 IU/week of HCG increased my T levels by about 10-15%, however already having quite bad levels (low conversion) of DHT and now adding a small bump of DHT (decent conversion) with HCG, does nothing for me. People who have a better natural conversion and an overall better DHT state will likely get a bigger bump from HCG, which might get them over some limit where they start feeling really good.