What you are describing sounds like chasing the so called "honeymoon period" in TRT. Every time you start a treatment that increases T, you are getting a testosterone "high" because your brain neuro-receptors are not used to such high levels. The moment the brain detects the high T levels, it downregulates the receptors and you feel "not as good" as in the beginning.
Nobody has found a way to stay in the "honeymoon" on the same dose of treatment. I've seen reports that the "honeymoon" reappears when the TRT dose is changed which again is explained by the neuro-receptor adjustment theory. Note that in TRT, you can reach any high level of free testosterone by increasing your dose and yet the brain doesn't respond because it downregulates the receptors further. So the real problem is not the SHBG or estrogen or the free testosterone but the body reaction to it.
Similarly, you cannot be constantly high on the same dose of a stimulant. Sooner or later tolerance sets in, i.e. receptors downregulate and the response is decreased. It is the natural way of the body to protect itself from too high levels of anything.
