I think gyno caused from Diselbolen is a progesterone/prolactin type thing.
I had experienced sore nipples with Diselbolen ONLY.... When I had stacked Disel with Beast in the past I did not have this issue. So when I felt the nipple sorness on a Diesel only run, I simply added in Beast, and it eased off. I was told it was something to do with Beast being a DHT, and DHTs effect on prolactins & progesterones. This is what I was told and luckily it seemed to work! Mind you, if you are going to go this route, I'd advise you run lower doses of both so you don't fry your liver!!!