any one talking about conversion rates of a pro hormone is either lying, or misinformed, or both. there are infinate factors that come into play, and will vary person to person.
and conversion is never a one way process, it can go back and forth, or even back, back.
but, androstenediol is able to bind to & interact with the androgen receptor. how much, will also be dependant on the person.
the 7a,17a dimethylation will increase this ability, but it will not bind as strong as a steroid with a 3-keto group, like bolasterone (dimethyl-testosterone)
I too have not had good experience with epistane, i tried e-stane once, didn't have good results, and never used it again. but hdrol, I have good results at 50mg, much less than others.