if you google you will find tons of info
here is one source I have read
According to research cited in (20), prolactin may have a direct stimulatory effect on mammary tissue development, but only in the presence of high estrogen levels:
The presence of mild hyperprolactinaemia is therefore not uncommon in patients with estrogen excess. Significant primary hyperprolactinaemia, on the other hand, may directly stimulate epithelial cell proliferation in an estrogen-primed breast, causing epithelial cell proliferation and gynaecomastia.
So rather than focusing solely on lowering prolactin levels which may be elevated in users of aromatizing androgens, attacking estrogen should be the first line of action.
source: (20) Ismail AA, Barth JH.Ann Clin Biochem 2001 Nov;38(Pt 6):596-607
and no.. you still need to worry about gyno and estrogen should be controlled just like any cycle using test,with lower estrogen there is less of a worry.
however gyno is not the only side effect,you have insomnia, night sweats, rapid heart rate, anxiety,high blood pressure and a loss of libido.
you wont have all of these at once you may have 1 or some or none at all,but the sides that do show up seem to be lessened with the high tren/low test combo