3 week old problems

Okay so I have two plants, they are dutch passion auto bluemazar, in 10L and 15L grow pots. A 300w led grow light about 30 cm from the plants. A fan blowing cool air around the pots and leaves. And a maintained temp of 70-80 F. They are at the 3 week mark now and all had been good until now. The light cycle is on 20hrs light 4hours dark

the leaves feel dry and brittle, and seem to be drooping down (not stretching up reaching to the light like they usually do). The edges of the leaves have also started to curl upwards. I have read around and heat stress comes up a lot also with ph in balances and nute burn.

so I have now flushed the soil, tested the run off ph at about 6.0. Re watered with just water no added nutes. The nute mix I was using was dutch pro A + B, only at 50% of the recommended levels for vegetative growth.

Any advice would be appreciated, I flushed the soil 2 days ago.

Do you foliar feed?

Also seems like you already have your answer from Google.
Google.com will be 99% more right than 99% of the people on these forums that spill out more bullshit than a rodeo show.

What is foliar feed? And yeah should I notice an improvement after flushing them? As nothing has changed since doing so and the leaves ares till very dry.

Foliar feeding is when you use a misting/spray bottle and use a ratio of nutrients + water to spray on them.

That can cause burn in half the time or less, it takes for a nute burn via normal feedings.
It can also cause a magnifying affect on the leaves burning them like what people do to ants using the sun.

I don't use foliar feeding at all. I have been using nutes but since have flushed them out with ph 6.5 water. I have now repotted in fresh canna soil and given it a small watering. Since repotting my plant has completely lost all turgidity and is now heavily dropping, I'm in some dyer need of advice. The leaves seem a very dark green and the stem bleached white. The lower leaves have some yellow patches on and the plant as a whole still looks very dry and brittle.