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Grow light Australia do some things called buddies. You could wire a small driver into your existing wire and then they have stick on pads , you could put string/s of them spread out under the 4ft space

Yeah, if it's off the chart it would suggest a long slow accumulation.. Which is why it hits mid flower. I'm a coco guy so can't give you the quantities and timings for soil unfortunately.

Going off your previous issues, when you start feeding, I'd start at lower dose, increase slowly .

EC is always the same scale, where ppm has different scales, so if someone says ppm we have to ask on which scale.

What's your EC of your nutrients?

If you've made changes , I'd see how things go. The last one you can see tip burn, and it looks heavy on N , though photos can be deceptive, so it might be a case of just reducing your overall nutrients to avoid the same pitfalls.

Well apart from having it independently tested , the best bet might be going full RO and adding back your calmag

I'd get online and find your water report. See what's in it that's making it so hard. Chances are if you're having issues mid flower it's something causing a lockout . A build up of something.

So it's in soil. Is it living soil or are you feeding an organic liquid based nutrient ? Teas and ammendments?

I can't tell if inder all that new growth is a plant that was ready. But it looks like a lock out to me. You've not given enough information though to diagnose. 8 weeks isn't a standard finishing time, despite what breeders might say

They should recover. But I'd still want it warmer than 75f More low 80s

And make sure its warm enough

I'd let them root out and go by weight of pot aa a guide to watering

This is a guess but if they've been accustomed to low light levels and then slapped straight under intense light levels they maybe in shock.

I'm a big fan of drain to waste coco as its forgiving. Though I am technically Recirculating. But one hydro system is much the same as another. They all involve well oxygenated nutrients. Forget about aquaponics and aeroponics. Too many points to fail.

With a light that emits lots of radiant heat (hps) 72f is OK. With one that doesn't (LED) 78f is where I'd be aiming , even more in veg.

74 is still very low though.

When are those low temps? Only lights out? Or while lights are on?

It's 60% coco coir though. I'd be going low 6s on ph

I'd post this I the newbie section as its not related to grow room design.