Hmm...That sucks. All but one hermied...? Any changes to the growroom, nutrients or enviornment? No light leaks or interrupted night cycles?

Am in hopes you're wrong about the BC Seeds being junk. I just started some of their Jedi (J41) and some of the Kali Skunk. For their customers sake, I hope it's an isolated incident. For your sake, I hope they at least sent replacements and a kiss-ass appology. (for their prices, the seeds should jump into the soil, water themselves, and have a red pop-up timer thing when ready for harvest)

I wouldn't risk backing this upcoming statement with my life or reputation, but I seem to get a larger percentage of females during the summer growing cycles, than my winter grows. Maybe it's a temperature during development thing, (seems to work for crocodiles and turtles) or it could be a catching-up to the law of averages thing. IDK.
I've often thought about this...but in the wild, the female flower has to be mature enough to be properly pollinated, so an early male plant might miss his opportunity if too early. In other words...are the males waiting for later in the season to sprout and mature? (is this why some seeds don't pop when the others do?) That would imply pre-determined sex while still in the embryo though. This theory flies in the face of my previous statement, but I thought I'd throw this out there and see if any others have valid insight, either way.