Hey BTK
For me, flowering begins with a flowering top, so when those white hairs are coming out of the very top of the plant instead of at the sidebranches, that's when I start the timer.
ER is right. Seed in bud is almost always hermie which means that it should be a female seed, but as mom turned hermie it's possible that baby will do the same.
I don't know any way of checking for hermies other than spotting those male flowers but to minimise the chance of it happening, make sure that there is no light and no interruptions in the 12 hour dark period.
Stick with the 2700k bulbs too. They are the flowering bulbs.