Once you have full blown Gyno, it is only corrected through surgery.
Gyno in the process of developement is corrected through, as you said, nolva or b6, depending on what substance you used..
The fact that you are not experiencing pain/discomfort etc. might mean that you have full out Gyno. It still wouldn't hurt to try b6 or nolva to see if it helps.
Not sure if M1T is progesterone related as I am not familiar with PH's....
That site is legit, though you should purchase the liquid or capped verision (not the powder) of nolva unless you know how to suspend or cap nolva.
If gyno from M1T is estrogen related, a dose of 60-80mg/day until symptoms subside should do the trick.