I will tell you that when I was over 1100 I didn't feel any better but I did start to notice side effects. Ache on my back and more hair on back and arms. Couldn't get more hair to grown on my head.... oh no cant do that.... LOL. Now that I am back down those side effects have reduced a lot.
I am 50 and at 8.89 so just under 900 and feel great. I take .25 twice a week by injection and no HCG or estrogen blockers. when I was higher i was on .5 twice a week which was due to a miss-communication between me and doctor. He wanted me on .5 for the week.
Bodybuilders take more than just testosterone to get their huge gains and they pay a big price for it. TRT is to get you to optimal levels not turn you into Phil Heath or Lance Armstrong...