Overwatering or Nutelock?

Well I'm on around 3 weeks veg and my plants are getting all droopy again after running fine for about 2 or so weeks. I had this issue previously which was solved by changing lights from 24/0 to 18/6 and watering less. I kicked the ppm up 3 days ago to between 550 and 600 from 400 and I have not watered since. I tested runoff from one of the plants and it was at 80ppm. They are grown hempy style under 600w mh about a foot or more above the plants. Temps are around 75f and rh is at 35%.
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Also check out my journal to help keep me inline and hopefully watch me get a solid grow under my belt.
https://www.rollitup.org/grow-journal-discussion/415600-grape-stomper-x-og-blue.html

id flush and start fresh. Its a tough call, but i notice some minor yellowing on the lower leaves which could be nitrogen deficiency. they do appear a bit droopy. what kind of soil are you using. and what is the ph of your your runoff?

Soil is 4 to 1 perlite to vermiculite. PH of the runoff is between 8.5 and 9. They yellow on the bottom was due to a cal mag def in the beggining I think.

well your ph is way to high. which explains the lockup. it should be between 5.8 and 6.3 i find that ideal. your medium choice requires that you have a well balanced fertilizer.

Yeah, when the water goes in it is alwayed phed to somewhere between there. Not sure why it's getting so high.

id recommend a different medium such as ammended soil. the soil acts as a buffer between your plants and the nutes. nitric acid, phosphoric acid, citric acid, or vinegar will lower that ph for you.

r u trying for one of those cup contests, lol. REPLANT them! Give those roots more room. Yes they still look overwatered, a with a bit of nute burn from previous feedings although now maybe nutes r locked out. ur ph is going to be high from the nutes ur adding & will continue that way unless u keep an eye on it (most likely as some of my grows r this way) & add vinegar as a regular additive at watering or get some ph down & use as neeed. I think u need to start adding some epsom salts as well.

Looks overwatered to me.

Yeah, I heard I should replant when they get to 6 inches. I've got the day off so I guess I can replant them today.

repot those and they will be happy