I could be wrong, but I don't see how a stress induced selfing could cause higher rates of hermi children. Like does the pollen have some magic hermie dust in it?
My understanding is that most cannabis plants carry the hermie gene as a survival tool, and like autism in humans, hermaphrodite-ism is a spectrum with some plants expressing both sexes more readily than others.
If the plant selfed all on its own under normal, non-stressful conditions, then I think its more likely you will see hermies in those seeds.
