Hmm… I kinda pick at them as I see things.
CG, iirc, leaves them alone after flip.
But rule of thumb is week 2 after flip, which is usually after stretch, and then again at week 7.
I do a big trim at week 2 & 7 but always clip as needed daily/weekly. However I tend to end up with lollipops. Just works out that way by the time I think it looks and feels right.
Aim for airflow and exposing bud sites and you’ll do great.
A few have told me I leave to many leaves by the end but every guru I’ve listened to has a slightly different take on it. I try to follow the logic and gut feeling for defoliation. I think I’m getting better each harvest.
You might need a second net to hold up your tops btw.