I am wondering if your diary statistics are correct, the plants looks to have big spaces between the node indicting low light or a light that is to high.
That brings up the 2nd point. It says your light is 600W and is only 10 inches away, That much wattage that close to the plant does not equal the growth pattern of your plants. It would also burn them, at least this is my learned experience from it.
I would look into the real wattage of your lamp and update the hang height if it is different and let us know if they are dimmed.
2nd thing I noticed if your PH is a bit low for soil. I use nothing below 6.2 and ideally aorund 6.4-6.8 and nothing over 7.5
Over all plants look good, more akin to a 100W-150W led vs 600. Keep it up and it should do fine. Next grow invest into a TDS pen and monitor the EC/PPM of your feeding solution to confirm your not under or over feeding them.
I would also good in documenting it fully from germination to harvest and all the weeks in between. It hard to get a good understanding from one pic listed on week 6 and not a lot of other information.
Best Of Luck!
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