Exogenous DHT treatment -- when to pursue?

I have seen several people recommend and/or report having success in treating PFS through introduction of exogenous DHT (i.e., Proviron, Masteron, or Andactrim). In principle, is this a treatment that should hold promise for a wide variety of men with PFS, or rather is it something that would primarily be for men who show low DHT in their blood results?

I have low T but test “normal” in DHT. Having recently started TRT, I am experiencing increased numbers of erections, but have not experienced any improvement of libido or sexual sensation (“numb dick”).

What men should consider trying exogenous DHT? Men with low DHT, or might it help for basically any PFS sufferer?