New leafs curling and burned leaf tips HELP please:)

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Hello everyone
Its my first grow and im having some trouble to find out what i have been doing wrong and i know that its the best place to ask questions :)
Im growing Royal queen seeds northern lights in soil (Soil that i bought from hydro-shop and made for cannabis grow) in 20L Air-pots
I have 1.2 X 1.2 X 2 M Grow tent with 600W dual spectrum Air cooled.
I started with 5 plants at 24\0 light for first week and changed it to 18\6 after that.
My plants now in day 40 .
I have been watering with PHed (PH down not lemon) tap water aiming at 6.5 and feeding with Biobizz nuts (bio heaven + bio grow half the amount recommended by Biobizz) from day 11.
At the first week i watered small amount of water (1 cup every 3 -4 days) As the plants got to day 11 i started to give 3 L of water and feeding every 4 - 7 days when my soil was dry.(it was taking it a week to be really dry)
After 2 fed`s i started to see 3 of my plant stopped growing so i stopped giving nuts (Biogrow + bioheaven) for 2 weeks and it didn't helped them so i had to say goodbye to them :(.
I now have 2 plants that developed nicely (70cm) in day 40 and they started to flower.
Now i see that im doing something wrong my top leafs are curled and skinny and lower leafs tip are burned.
What do you think is the problem ? View attachment 411448View attachment 411449
 
Attachments didnt work for me but 3l of water seems like a lot to give young plants. I try to water every other day and wont water unless the pots feel light, and thats how I gauge how much I water. My bigger girls are drinking about 2l every other day now, and they are about 45 days. Burnt tips often caused by too much nutrients, but I thinm pics would really help if you can get that sorted out
 
The twisting on the new growth and burned tips could be a sign of too much nitrogen. Can you give us more information on your soil? What is it composed of, any amendments such as worm castings or guano? Also, besides pHing your feeds to 6.5, have you check the pH of your run off, the water that comes out the bottom of the pot when you water? I'd be curious to know what it's reading.
 
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