Your shbg levels are low because you are on androgens. Why do you want to raise shbg levels? Shbg lowers the amount of free test in the body which is why people often take proviron or danozol to lower shbg levels. I think your low shbg levels are just fine.
I also echo others comments about hcg helping with libido. I suffer from the same thing you do and find hcg and cialis to provide a major boost. Try taking 2-3 shots of hcg a week at lower dose and see if that eventually gives you a boost.
Someone mentioned dht. Dht is obviously important in libido. Why dont you try to get a fuller spectrum of bloods that covers total test, free test, progestin, estrogen, estradiol, dht, etc.
Like someone mentioned, dopamine does play an important role on libido. I used to take bromo while on tren and it made me horny as hell. I didn’t like the side effects of bromo though. I have also used l-dopa and tyrosone to naturally boost dopamine partly because I have likely lowered/decencitized my dopamine through my use of adderrall and other prescribed meds.. It would be speculative for me to suggest this is your problem, but do analyze the meds you take and your lifestyle and consider if dopamine is possibly a problem. Things that may affect your dopamine by lowering it or increasing the number of receptors in your brain (ie tolerance) include amphetamines, recreational drugs (cocaine, opiates, ecstacy, etc), certain prescription drugs (eg psych drugs), addictions (eg porn, gambling, alcohol, monkey pussy, etc).
Also, you say your dick goes limp, is your problem maintaining an erection or libido (desire) or both? For example, do you feel horny a lot and think about sex a lot or have you noticed a decrease in actual interest? When you go limp, do you simultaneously lose interest or are you feeling horny and wanting sex but going limp? If it is just an erection problem, cialis should be your solution. If the problem includes libido (interest in sex), then that is where we get into the other factors (T, E, Dht, Progesterone, etc).
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