Dude that is an almost pure if not pure Sativa (depending on where you got your genetics). she has AT THE VERY LEAST another 3 or 4 weeks to go. GREAT high, but not for the first time grower. Even most experienced indoor growers get impatient waiting on Sats.
And YES you will definitely regret chopping now!
Stop flushing, and feed them some more (lightly) Quit worrying about pH unless you are set up hydroponic, and don't worry about flushing. Just quit feeding about a week before you chop, and don't water for a couple of days before you chop, But for gods sake, don't chop now!!! Nice looking plants!!!
Yes, Jack Harer is right. Feed them. Your plants are probably eating themselves to death because you aren't giving them nourishment.
I recently read a huge thread (with modern scientific backing) on this web site debunking the myth that MJ plants shouldn't be given nutes in their last week or two. There is nothing but bad that can come from NOT feeding them at their most critical stage of THC production. And taste isn't affected, since nutes are stored in stems and branches; not in the buds themselves. Feed them till the last day, and forget flushing.
Outside, Mother Nature feeds them till the very last day. Because they need it. And She doesn't flush them. Because they don't need it.
Anyway, you must look at trichomes in order to accurately judge harvest time. Leaf color, skunky smell, pistils browning, etc., are nice things to observe. But they are not a consistently accurate indicator of when to harvest. Only trichome color can tell you when to harvest.