The plants can grow 2 to 3 times their height now when you flip into flower. Also, since it was bag seed, you have no idea how long you'll have to flower for. The one I've got going now appears to be a 60 day or less flower period. 8 weeks isn't that long. But what if yours is a 17 week flower? And it could very well be since you don't know the genetic makeup of the plant. Are you prepared to wait 4 months or more to flower those out with your setup?
I found something really good in bag seed. But I also knew that if I got to 90 days on this bag seed I probably wouldn't have kept it because I lack space, and couldn't have one plant occupy my tent for another 2 or 3 months. Just some food for thought.