Keeping in mind this is all theory:
The only way to know is try. There are people who shed on primo and those who don't. I started loosing my hair at 17 and NOTHING I used accelerated it or slowed it. I understand wanting to keep your hair but, IMO, if androgens cause you to loose it then barring you taking direct measures it's going to go sooner or later.
You have used primo as you stated so only you know if the benefits outweigh the potential negatives. Why not stick with the test and NPP as you know this worked and was easy on the hair?