Im am still generally ok with fem seeds. One interesting fact that I learned lately from males and females is the Y chromosome. from the M & F testing Ive done with seedlings.
So its assumed that you cant really change genetics via stressing. Even regular seeds can hermie on you depending on line, sex plasticity is something determined by genetics. This is my hypothesis on this.
If the line has hermie tendencies its best not to go with that line, GG4 for example. But I didnt have problems with GG4 S1. Its best to draw your own conclusion from growing fem seed lines.
Breeding from S1 is very questionable. This is why I dont generally carry femmed elites. i think chemical methods change phenotype expression but dont change genetics. its theory anyways. but to be on the safe side go with something that is normal.