m0useanswered grow question 3 years ago I've had my one plant look like the 2nd pic in your question.
The temps and lights where fine, I'd say this is more of a PH issue.
granted the canoeing of top leaves tends to be light and or heat stress.
Your diary says your running a PH of 6. That's on the high side for veg in hydro.
I'd try lowering that down to 5.6-5.8 then back up aorund 6.2 in flower.
your PPM is also a bit high for week two. I'd try lowering that down by a few hundred and then raising it slowly in the next week.
the GH trio line runs hot from what I've been told.
Best Of Luck!