I always try to keep things simple. A healthy plant is a healthy plant. If they are growing and not showing any signs of stress then don’t change anything and keep checking your trichs, when you start seeing ambers it’s probably safe to chop anytime.
Clear -Premature
Cloudy- prime
Amber- degrading
So if you wait to chop when you start seeing ambers, most if not all clear will have become cloudy which is prime time. Keep your ladies healthy inside and out: nutrients, environment etc... and watch those trichs. Don’t worry about flush unless you keep your ppms high. I continuously cruise adding water, ph adjuster or nutrients to my res whichever is needed. I keep a blue lab guardian continuously reading my res and keep ph at 5.7-6.2 and ppms anywhere from 750 - 1200 during flower and never really flush.