I do not have specific experience with women and epistane, but I can give you a rule of thumb that repeatedly has proven pretty accurate.
For most anabolic steroids (Winstrol would be an exception on the worse side, testosterone is somewhat on the worse side also, and Anadrol believe it or not would be an exception on the better side) whatever dosage might be used for a man to give a cycle that’d you’d characterize as pretty mild yet modestly effective, divide it by 10 to give a cycle that’s pushing it but may be non-virilizing and certainly will be effective for a woman.
For example, testosterone 500 mg/week is a reasonably mild cycle, just enough to start being serious for most. You wouldn’t call it super-light for a beginner, nor is it a pro competitor dose by any means.
Testosterone 50 mg/week for a woman is at least quite serious. Actually it’s quite substantially likely to be virilizing: to make that a starting dose with no previous experience would be pushing it. That’s from testosterone being somewhat worse in this regard than most synthetics. So you see, dividing by 10 is if anything being conservative in how much to reduce for a woman.
(Would 50 mg/week be a pro competitor dose for a woman? Nope, for today’s female pros, the comparison would be to male cycles far beyond 500 mg/week, just as male competitors are well past that.)
If epistane is midrange (probably is) for virilization compared to most anabolic steroids, I’d figure epistane at more like 3 mg/day as an initial estimate.
I would not go by what one finds on bro boards because the number of guys that have virilized their girlfriends, who often do not want to be virilized, is huge and most of these guys think they did great and report their work as brilliant. Just as there are posts out there saying 50 mg/day Winstrol is great for women, there probably are threads touting 10, 20, or even 30 mg/day epistane. But you haven’t seen the actual results.