I have only grown scrog. I love it but there are some things you should know.

Stretch is one thing. After you switch to 12/12 the plants will typically grow to 2 to 3 times the size they were before the switch. If you "fill the screen" before you switch to 12/12 you will have no room left for the new growth. Let the screen fill about 2/3 to 3/4 of the way full before you switch.

Cloning after you switch to 12/12 will work but it takes longer for them to root. The longer you go into the 12/12 before taking cuttings the longer the process will take. And the lower the success rate seems to be. I would try to get cuttings no later than 10 days or so into 12/12. (2 or 3 days would be even better)

I have sometimes had to take clones of clones to delay the time process because my flower chamber was not yet harvested. Don't worry about all that "decrease in yeild or potenecy" stuff you read about.

Check out the "Barrel of Green" method of scrogging, it has the most potential for maximum production in a small space.

regards,
Max Blast