Proof that she is a sexy girl. Just showing she’s mature enough to start pre-flower. For a timeline think of it as having flipped a photo about a week ago. It may stretch a bit then stall and start flower stretch soon after.
I do, others dont. The signs of when to do that are the same for the two types, I think. I stop feeding last two weeks, thats usually when you begin to see the trichs go opaque but before I see any amber.
When the little white hairs start to show are you leaving your lights running 24/7 since they’re autos or what does your light schedule look like at week 5?
You should try flushing your soil, and you should also give a try to flushing your plant at the end of the grow. Do one of each in a grow once, see if you feel the same way.