What are your labs for Total T, Free T, and E2 while on 150 mg T per week?
At that dose/frequency, you're right at the top end of TRT; any higher and you're cycling and no longer on TRT. You might get some relief from the prostate symptoms if you ease off on the T dose, if, for example, your Free T and/or E2 are on the high side. If any one of the three are above the top of the normal range, then you definitely need to reduce your T dose.
Men in their late 40s don't need to be on TRT to get an enlarged prostate; that's more or less when it starts to happen. Short of estrogen injections, there isn't much out there that shrinks the prostate.
One alternative to T injections is HCG only - assuming you still have the Leydig cell capacity to make your own T. It does not have the extreme T peaks and dips you get with T injections. When you inject 150 mg T, sometime in the next day or so, your T level peaks at 1,500 - above the top of the normal range. Those once a week peaks are not your friend when you have prostate issues.
That doesn't happen with HCG. T production is sort of self-limited by your Leydig cell capacity and the Leydig cells are surrounded by fat that convert some of the T to E2. That self-limiting effect is why men who want a high-ish T level (rather than just a NORMAL T level) don't use HCG.