Sugar Leaves and Some Pistils turning brown?

I've been growing this auto for about 9 weeks from seed.
300W LED (~150W actual power draw) 19/5 schedule
Dr Earth Pot of Gold soil, 5 Gallon pots. Did not mix in perlite (I will next time).
Watering probably too often. I've stopped watering until the pots feel very light.
Feeding General Organics BioThrive, BioBud, and CaMg+ as needed, every other week or so.
It's in a basement which is a bit cold this time of year, about 60F around the clock and pretty dry.

I haven't been able to find pictures of anything similar. I'm so close to the finish line on my first grow; the plant has already been through a lot and I know it's not going to yield as much as I would have liked but I'd like to try to save what I can. As you can see, the sugar leaves are turning brown along the veins as are some of the pistils. What could this be a sign of and what should I do to try and save this girl?

EDIT: if you follow this link you can get the super hi-res image to get a lot more detail: https://www.rollitup.org/attachments/imag0170-copy-jpg.3859624/