Getting the rust off

Over the last 2 days, the back left plant has been putting a lot of purple into the leaves instead of just the bud; I'm so happy to see these pretty colours. It's giving me a bit more hope that this might pack the punch my wife is looking for. It's also just sad that most of the best purple leaves also are suffering from light burn being too close to the light (but too late to change that). Seeing the back two plants not pack bud on super tightly (this might be because the main colas are too close to the light), and the 3rd plant foxtail like crazy has finally pushed me over the edge to try to clone the 4th plant. Initially I didn't because when I flipped she barely had vegetation. At week 3 I didn't because I was wondering about potentially epigenetic changes from revegetation potentially not being great for a mother plant. Now much later I finally just had to. And I'm extra glad that I tried now that plant 4 is starting to show a bit of purple on the bud. Of course, if she takes a similar progression of the back two plants, she's got 2-3 weeks of purple bud, and 1-2 weeks more of slowly purpling leaves. Speaking of purple, the leaves are really starting to show nicely. But I am losing my mind a bit; I'm ending week 11 since the flip, and 2 plants might be another week yet, and the other two may now be looking at 2-5 weeks more? They're so fat, I'll have to give them the time they need. I always thought "flowering time" was from the flip, not from bud appearing. In theory GDP should be 8-10 weeks. I'm tempted to try doing something like putting ice packs by the air intake of the tent when the lights go off to bring out more purple. If the back two aren't ready yet by next week I might switch to 11/13 and possibly 10/14 another week later.