Admittedly, I'm not well-read on the topic of DHEA.
However, I believe it's a little unpredictable with regards to how and what our bodies do with it during conversion. In fact, I think that's the reason I never pursued looking into it more closely.
You may want to try posting this question on the Steroid board.
Better yet, consider shooting Van_Bilderass a PM. The owner of that account posts some excellent knowledge on here, and seems very generous with information sharing.