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!!!