Ready for flowering phase?

Not ready let her get back on her feet before switching to flowering

stop defoliating like that, as others said -- read 'to defoliate or not..' on cocoforcannabis.com. Their guides and articles have the least amount of bro science you can find, but their forums and user-submitted stuff is just as suspect as every other grow site, lol. when you flip to flower isn't a maybe... it's cause and effect... how much space needs to be filled by this plant? if it's filling roughly 1/2 of that space, it's good to go. It's not something you ponder. You have a goal or target, you wait for an observable trigger and you send it into flower. Lots of genetic variety out there, so over time you'll learn the best happy-zone as far as how much space is left to fill... the older the plant the more potential to grow after flip (assumes growth is not limited by pot size or enviornment etc... common sense stuff). A 4-week vege might double and a 8 week vege might triple... then genetic variety on top of that... don't overthink what you can't control... take a note, a pictur ewhatever to keep track of how/when you flipped and adjust your process based on results... not every garden has teh same growth rate so how you do things makes when you flip different than anyone else.

You can grow 12/12 from seed. There are no rules when comes to, it's just that some cultivars perform better than other when comes to that, but the quality of the flowers will stay the same. Only yield will be affected. Too long veg is worst than too short for the general health of the plant development - less problems on a long run.

You could, but you have destroyed your potential by removing all those leaves that were going to make the energy that your plant needs to grow its flowers. You would be better off waiting for a new flush of leaves to grow before sending it into flowering.

Yes, definitely. They grow like rockets shortly after the light change before the flowers come. The so-called "stretch" can even reach up to 350% depending on the strain and age of the plant.

Not really mate I'd leave them another 4 weeks minimum

It's up to you how you want them, but theoretically, you can send them into flowering already. However, if you want them a bit bigger, wait another 1 to 2 weeks. But if you want to harvest faster with a few less buds, then you can switch them now.