Slow growth ?

I think you need to add more perlite for the future, the roots suffocate even with a little watering.

You'll all think this sounds odd, but consider that the primary issue here could be a borderline Calcium deficiency. I'd recommend switching to a two part nutrient with a ratio as near to 19-19-21; this will introduce calcium, and you'll be able to leave out that boost product from which the excessive potassium is causing burnt leaf tips.

I would increase water and decrease neuts. They look under watered/overfed

It looks a little underwatered, due to its droopy leaves. Stick your finger into the soil and see if she needs some more water. Try to find a good watering regimen for the plant, like Noriu was saying. I give my plants 1/10th of their pot size in water every couple days as a starting point. Then, i wait an hour and lift the pot up to see if it needs more. Other than that, i don't think i have any tips for you. Different genetics will make different cultivars(strains) grow differently, just like Grannie was talking about. Each cultivar that you're growing will have a different environment that will maximize its growth. If you're new here, please select the answer that helped you out the most by clicking on the "answer" button underneath what the person said. If you have any questions, feel free to message me on here. You can pull up your messages tab by clicking on the little airplane in a bubble. It's located on the bottom-right of your screen. I hope this helps!

Ph ph ph , think its the issue, roots are fucked on all plants, even which stand next to this girl. Solution - good watering regime and right ph in , for soil its 6.3 I dont believe in flush, saw more mistakes than handful good results, if you go my way - in few weeks they will start to grow in better rhythm, damage will still stay....