Gyno is caused by excess extrogen, usu. from test. aromatizing into estrogen. You're going to hear alot of shit about this, but gyno is to a great deal, genetic. It has alot to do with where your estrogen receptors are. Armidex, Nolvadex, Clomid, etc. etc., some guys still get gyno. I've seen some really gross looking bitch tits. What's really funny is the stupid cocky shit who thinks he has big pecs when he really has big boobs.
Anyway, just run your anti-e as needed, watch for signs of excess estrogen, and if you see them, up your nti-e or discontinue our cycle, followed by PCT. Lots of pros have had gyno surgery, so its not a big deal, but if you can't afford it, be esp. watchful for it.