Trestolone fulfills the roles of testosterone in the body in every way except the conversion to DHT. However, the high androgenic nature of Trestolone compared to that of test seems to have mitigated that one area where it's lacking. As a test base go with TD Trestolone you won't be sorry you did. There have been logs where people have completely dropped their TRT regimens and went with Trestolone solo and said that it is a viable test replacement. There are a few individuals that also saw it to be better than test.
This makes sense as Trestolone is being used in clinical trials for the exact same purpose - HRT purposes. You asked for a test base alternative, this is it, look no further. Olympus Labs (I'm a rep) sells TD Trestolone.