Issues with seedlings in top feed RDWC

Hello fellow growers

This is my second grow in deep water culture.
I am growing 3 “707 headband” and 3 “the new” both from humboldt seed organization.
All 6 seedlings were started in rockwool cubes 8 days ago.

After their first set of serrated leaves began forming, I moved them into my RDWC. My system has a drip ring that keeps the 6” net pots of hydroton saturated. I have a 1750GPH pump that supplies all 6 buckets with air (2 air stones in each bucket).

I filled the system with 880PPM solution containing:

Starting with R/O water
Mills Basis A
Mills Basis B
Mills Vitalize
Mills Start R
Botanicare Cal-Mag
Botanicare Silica Blast
Hygrozyme
SNS 209
Great white mycorrhiza

I check on the plants many times a day and the conditions are always pretty similar:

Air Temp: 77-80
Relative Humidity: 40-70
Air Speed: slight movement of leaves
Water Temp: 70
pH: 5.6-6.0
PPM: rose from 880-1000 over a week
(I have added R/O water to bring it down to 620PPM)
Water level: hasn’t changed yet
[CO2]: 800PPM
PPFD: 250 μmol/(m^2 x s)

The “707 headband” seedlings are looking better than “the new” in my opinion. 2 of the “707 headband” are showing slight burning in the tips of their serrations, one of them is looking pretty solid all around. 2 of “the new” however, are super droopy, no sings of burn though.

I turned off my top feed because I figured the plants were over watered (rockwool cubes were wet to the touch). I did this yesterday and they’re still droopy and tip burn is spreading slightly.

Any thoughts or opinions would be great, it took a long time for me to get my hands on these genetics and I don’t want to loose them.

Thanks everyone!

“707 headband”
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“The New”
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Shit it's been a month how they doing? My first thought is the PPMs are too high at 800, the first two pics look burnt a little.
 
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