I am on TRT as well, 150mg per week. As mentioned, the gains will come slowly. Nothing extra, just as they would as if your test was naturally in the 700-900 range. In addition, if your nutrition and diet are in check, you should also see a bit of reduction in body fat overtime as well.
These are additional benefits, the primary concern is your health and that you feel better mentally and physically.
TRT changed my life or I should say, gave me my life back. Low T is no fun. I ended up on this forum after my Doc put me on TRT. I was given little information by him and came here to better educate myself. Stick around bro.