Do I need to trim this plant for SOG?

[SamandMax]

Because of some trouble with my plants I had to revert them to veg. The branches started to grow a lot. But now I switch the plants back to flower. Yesterday I cut all the branches. Only left the upper third of the plants.Of the best plants I used the branches for clones.

After removing CO2 and lowering temps (switching to external air) - plants sick?

ok, I reverted my plants from early flower back to veg again. Most plants created lots of foliage in the meantime, although some plants didn’t make it. The best growing and robust plants, I preserved and I took clones for the next grow already. I did prune my plants foliage a lot. I only left the upper third part of foliage of the plants. I am going to switch them now back to flower. What worries me a bit is that some leaves still showed some yellowing. Is it normal that when the plants grow bi…