Recommended Veg time?

Looking good @Bakrauf68. I see you have listed you are going for a sog style grow, in which case its typical to flip to flower on sog at 4 or 5 weeks, but if you do the flip this early you will yield less. With your setup and how your girls look, I would reccomend doing some topping and LST with your trellis net. Once your canopy trellis is filled out with the new tops and weaved across your trellis to keep it relatively even across all three plants on height of your canopy I would let them go another couple of weeks at least. You will essentially be doing more of a scrog rather than sog, but you'll be happier with your harvest results than just running three plants in your tent sog style. If you had a few more plants in there a sog might be more effective for more yield. In regards to your leaves discolorations, they are the beginning of a magnesium deficiency. I know your nutrients are PH balanced, but I would still make sure your medium is properly PH'd and after you are sure its properly ph'd, you can add some calmag. If your PH is not balanced correctly you will see your plants suffer because without proper PH they will begin losing more and more of their ability to feed on the nutrients that are already available in the soil. HTH