At this point I would not defoliate anything. You can do a light defoliation after the flowering stretch is over. The only time this is needed is when the foliage is so thick that there is no air flow around the buds creating a risk of mold. Yours dont look dense enough for that to happen. You want to leave as many of those fan leaves as possible now because when they finish up flowering they are going to pull all of the nutrients out of those leaves in a last attempt to bulk the buds up. If there are not enough fan leaves they will pull nutrients out of the sugar leaves leaving brown leaf in your bud. Definitely dont want that. Hope this helps. Good luck flowering them!