Do you think my mothers could be getting too big in this setup? Will they stretch because they have alot of fresh soil now or not since theire old alr.?

In 2-3 days the roots havent colonized the new pot, fully. Still might cause a little extra growth before vege growth stops in flower phase, but given the timing, i don't think you have to worry about anything crazy. You might not see roots throughout 40L of volume by the end, so it's effect will be limited too. I think you are safe and that the plant will be limited by how much time it has to grow in flower phase and avoid too much extra growth relative to space caused by pot size. The fact they are mature mothers with size that already fills the area of the tent will probably result in some over-crowding regardless of pot size. No biggie. Just prune them to fit. If you think they are too tall to start, prune back a few nodes to reduce height before flip and give 3-5 days to heal, preferably.

High Lerome, The plants will start to stretch during the pre-flowering phase. Just flip them first and fill up the SCROG net. And when there are branches growing under the SCROG net (not receiving any light) and when leaves are stacked on eachother blocking airflow you need to cut them off. Next to that they will make a really nice screen of green and will not cause any problems. The plants will not grow a lot bigger because of the larger pots but they will due the pre-flowering phase. Make sure that you water at the outside of the pot to let those roots grow towards the outside for a healthier rootsystem and the most benefit from the larger pots! Happy Growing Buddy! 💚