Do you have experience with cloning? If not I would take all small lower branches from your first prune on and try to root them. It can take three days, three weeks or longer to develop roots. All depends on the mother, conditions, and the cutting you take. If they were going in the trash anyway might as well practice with them. A compost bin full of practice clones is better than lost genetics.
I run perpetual grow on primarily 10 week flower strains. Currently coming up on 25 generations of clones from from one Jamaican seed but 32 mowi wowi was my longest run.
week 1 flip 12/12
week 2 trim off 3-6 lower branches and clone. Mother is in full flower.
week 3-4 clones grow roots in cube
week 5-6 clones start to reveg and develop healthy roots under 18/6
week 7-11 Fully reverted clones growing over the 5 weeks.
week 12 Harvest mother and move the clones into "flower week one". Repeat.
For every week into flower the clone cutting needs an additional week to reveg. It also has less stored energy to develop roots so success rate drops. Take cuttings before the flip and you eliminate the revege time.