My comment was not intended to suggest you'd become a Superman overnight. This is the notion that makes the subject taboo for many people - the use of testosterone as a PED (Performance Enhancing Drug) and not for replacement therapy. I was referring to just feeling better with more energy and hopefully an increased libido. You can take as much as you like, but without intensive sports training, you won't gain much muscle if any, so I would like to put that notion to bed.
I don't know what your doctor was using to increase your serum testosterone levels, and they were probabaly very conservative, only raising your serum testosterone very slowly - so it took 3 months. I'm sorry to hear that your journey was so slow.
I still stand by my statement, and I will qualify it. If you take a 250mg jab in your a** (1 ampule), you will very likely feel different and better the same day, but certainly by the next morning if you have below normal natural testosterone levels.
How much you supplement will depend on your blood panel. If the level gets too high, so will your estradiol, which is not a good thing. It also increases your DHT levels, which will speed up hair loss. As you say, high end of normal is good place to be, but not over.
I'm not suggesting you should undertake TRT without the supervision of a doctor, but many doctors can be the problem, not the solution, and they can charge through the roof.
A lot of people are trying to avoid the needle, but it's still the most effective and cheapest way.