Hey there. I've read that your "XXL" strains tend to take a little bit longer than others. I think hairs can tell you lots but the trichromes will tell you more. How do you like your weed? Anxious then harvest when they're clear. Perfect high, then aim for 1/2 amber 1/2 cloudy. Stoned to the bone and stuck in the couch or bed, then harvest when nearly all amber. 😁
P.S if you can get humidity down and temps a little lower that can boost trichromes and colors and maybe terpenes(high heat can burn those off, but your heat isnt too high.)
Happy harvesting.