Sorry.... Totally disagree with the advise. Only follow bro science when there is nothing else.
AI should be used (arimidex) ..25 eod. This is prevention from gyno, once you have gyno, forget the adex. You need letro. Letro is after you were silly and did not take ai or not enough.
Nolva is pct (trying to get your body back to normal operation), not a good choice for gyno.