AsNoriuanswered grow question 2 years ago If you do it i found two ways usefull.
1. Defoliate 2-6 days before flip and then dofoliate when small flowers will be on all plant, not just tops. Around day 14-21 of flower
Defoliate now, give 5-9 days to recover, flip, defoliate on 7 day, no visible flowers yet, preflowers only, maybe top cola is showing first bud. At such time.
I found those ways most efficient
Happy Growing !!!