Hey Growmie,
You can certainly push them to Week 9, the photo you took with the jewelers' loupe does still show quite a few clear trichomes, you probably could take it longer than Week 9 depending on the type of feeling you're trying to get out of it. You can actually wait until the leaves have completely faded out since you've been flushing. Feel free to shoot me a holler if you ever need any help, I'd be honored to assist you. Hopefully, this was helpful, and remember ... "Happy Growing" and "Free your mind one puff at a time".