Hi there BBL, when trychomes are clear they've not yet produced THC, fully milky trychomes are potent and full of THC, amber trychomes have been oxydised (rusted from the oxygen basically!) that's why they they are a reddish color, these trychomes are damaged and have less THC in them. So to get max potency you're looking for all milky no clear trychomes. Wish i had an easy answer for you, but every strain's trychomes basically ripen in their own way but a good average rule of thumb is that trychomes take around 2 weeks to ripen. I've grown this strain before, you're looking perfect so far, you should be ready before the end of week 10 , and you can start your flush now. In soil just water with plain water until run off for two weeks, that should do it. The flush wont really speed anything up - nothing you can really do to speed things up so late in the process. Take your time, you're almost there, and it's looking 10/10. hope this clears up this question ? good luck ! 🚀