lotus, you reported:
"Concentrations of aromatase and estradiol in the prostate are low, indicating that estradiol may not be the only estrogenic molecule to play a role in the prostate. It is known that DHT can be metabolized to 5alpha-androstane-3beta,17beta-diol (3beta-diol), a hormone that binds to ERbeta but not to AR. The concentration of 3beta-diol in prostate is much higher than that of estradiol. Based on the high concentration of 3beta-diol and since this metabolite is a physiological ERbeta ligand, we hypothesized that 3beta-diol would be involved in the regulation of ERbeta expression."

and that's fine, but... you know that this is not the case in male breast tissue, otherwise you should have breast growth like bio-female...
in men there is more androgenic expression than the estrogenic one. Maybe estradiol is not the only estrogen, but the DHT metabolite "3-b-diol" isn't enough to gain breast growth in biomale breast tissue.
I think that DHT is not converted to the "estrogen-like metabolite" in the breast, at least not in the same amount as it is in the prostate.

So that's why i think that is better low DHT for breast growth