I can't work out how to send a pm!! lol
I'm not sure when the latest into flower it is possible to defoliate, but a lot of people defoliate twice in flower at roughly 3 weeks and 5 weeks. Some just defoliate at 3 weeks then leave the plants.
Unfortunately we are not allowed to have a conversation with other people about this so that we can compare notes, which is something I'd dearly love to do. We might be able to find out the answer to questions like that. There are lot's of things still up for debate regarding defoliation.
What you have shown yourself is that plants don't wilt and die when you remove a leaf, like some people would have you believe. Hopefully that will give you the confidence to try some more experimentation, but don't make the mistake of defoliating in flower when you haven't defoliated in veg. This is the big mistake that people make and then moan because they stunted their plants growth, you must defoliate in veg if you want to do it in flowering!!
I know you're probably itching to pull a few more leaves off to see what happens, but the best time to practice this technique is in veg when the worst you can do is extend the veg time a bit. As long as you plan it into your schedule then you won't really go wrong, just leave 2 weeks for the plants to recover from any defoliation before switching to 12/12.