If I said in 5 years, growing known hermies, I have yet to see a single nanner, would anyone believe me? Ive found maybe 10 seeds in that time but no nanners...
Now if I grow known hermies, then why am i not getting these issues in bloom?
true hermaphrodites are both sexes from the get go and show male flowers in veg even -in my experience.
theres a big difference between those, (which you wouldnt even be able to keep) and female plants which show some flowers of varying degree in flower. most females will put out a flower at some point. some bad genetics will put too many. but then actual hermaphrodites you wont even get a proper bud from.
edit: i think what you are saying is you had strains which although female, are prone to put out male flowers. but you dont get them. most likely they are sensitive strains but your conditions are preferable so they dont get stressed.