Beginner needs help, nutrient deficiency or nute burn?

[H.man]

Hello

I have been growing auto’s and i have 6 of them in a tent. With mars hydro Led150w
The 2 tall one's are about 2 months
The other 4 About 1,5 months old .
I put them in
35% 5-5-5 earth
35% peat
15%perlite
15% vermiculite

The vegetative stage went really well in my opinion, except for 1 small one.

2 weeks ago
I noticed they started getting yellow so I decided to give a little more nutrients, I am using tripart flora grow
Putting my water at ph 5,6-6.3
And each time I water I measured the ppm at around 1.6ppm
I gave this to all 6 of them
maybe I should have only given the 2 tall ones this high nutrient amount....


But after a week
I noticed they all started to get yellow
So u thought I was giving to much nutrients
So I started flushing them
I had a runoff of 2.0 ppm for the bigg ones and1.5 for the smaller ones (4)
I flush them until I had a run off 1.3 for big ones and 1.1 for smaller ones
I give 3 days of water with ph 6
But I don't see any improvement
I can notice the tall ones are more yellow and the other ones are getting these yellow patches between the veins of the leaf, wish turn into small burned spots.
I have the feeling I messed up Here

 

[Edinburgh]

Looks like a bit of nute burn and a nitro deficiency. But what do I know?