I would defoliate, do some low stress training, and maybe wait another couple of weeks. Also depending on how your light fills the tent I would give them some space between them. Do you have another round in Veg? That helps me decide if it's time to flip, keep the rotation turning. Those look like they are in great shape to take clones from. I would take clones, defoliate, spread out and let them recover for two weeks and then flip. Depending on the strain they could stretch considerably. Looking good though, nice work!