How to recover from over fertilizing

My first grow,

Growing purple kush from BCseedking.com 6 weeks old in Veg.
In soilless mix.

Using DNF gro nutes plus some black and gold.

I definitely over fertilized them. (Too much gro A and B) All of the fan leaves are a deep dark green, very dry and crumbly and drooping. Some have dark burn marks coming through. I have lost a number of fan leaves so far.

I am sure now that I mixed the solution wrong. Typical Newbie mistake.

So they have all been flushed twice and are now on straight water.
I Ph balance every drop of water I use to approx 6.0

My question is now what?
I have read that I can expect a poor yield from these 6 plants and regardless of the new growth I may get, the leaf damage and especially root damage is permanent.

As this is my first crop I would like to get as much as I can out of it while I start the 2nd crop. (I am so done with buying weed)

So far what I have done is flushed x2, cut off some big, droopy, damaged fan leaves so the light can penetrate to whatever new young growth there is under the canopy.

They are still on 400HPS + 4 3' T5's

I was planning on taking 2 clones from each plant this week. 1 for backup/2nd crop, and 1 for keeping until after harvest when I identify the plant I want as mom.
Then switch to 12/12

Can I still successfully clone a damaged plant 6 weeks from seed? I see a lot of lower branches that like good clone candidates. They don't appear too damaged.

Is there any point to picking a mom as they are all damaged to some degree and I wont be able to pick the best one?

Is there anything else I can do to help the plants recover?
Should I wait longer before I attempt to clone or flower?

Any advice appreciated.

Famine

Anybody?

I have posted these questions in a few spots but no feedback.
I would really appreciate any help/advice.

Many Thanks

how long ago did you flush ?

Flushed about a week ago and again a few days later.
3 of the bigger plants have also been transplanted into bigger pots. (3 Gal from 1 Gal)
They were close anyway (waterings were down to about every day and a half) and I thought that some fresh clean medium would do them good.
A couple of them have lost a number of fan leaves.
Still hoping to take a couple of clones off each one and throw into flower sometime tonight.

I also ordered more seeds just in case the clones don't take.

I really need a first crop. Buying weed and buying the gear for a grow at the same time is killing me.