Leaves problem

Hi I hope you will help me with my problem (or just my paranoia )
I have a problem with a little twisted leaves and some spots on my plants..
I grow five Northern Lights (Vision seeds).
Substrate is BioBizz light mix - Ph 6,2 EC 1,2
I putted them to the substrate 14.4, all seeds germinated 18.4
When problem started (it was visible after 1 week of grow on all five plants) i was using only Root stimulator (Hesi)
Now they all have aproximately 5 inches height and except the leaves, they look very good, i think.
I have them near the window, thea are going to outdoor.
Humidity is stable 40%
I don't know ph of the water.

hi no experience with outdoor growing, but to me they look ok other then streatching due to lack of light, id sugest getting to know the ph of your water, and whats the temperature of the grow area? if you wanted to curb the streatching then repot them stalks aswell just below the first leaves, the burried stalk will turn roots out of it, then bunch the pots together and drop em under a couple of cfl bulbs this will keep the nodes closer and hardy them up before they go outside, light mix has feed in as im sure you know, so keep an eye on them and feed as needed, it might be a temperature thing with the leaves, warm day cold night sort of thing, hopefully someone with more experience will come along!! but other then that they look ok to me
good luck
cozz

Temperature was never below 60°F.. Mostly is between 70°F - 75°F
I do not have any CFL.. They will go outside in a next 2 weeks, I will burry the stem then (i do not have larger pots and it would be difficult to repott them outdoor).. Still, thank You , and sorry for my English

Ph is one of the main, if not the most important parameters. Don't bother growing if you ain't going to check and sort the ph. You'll run into endless problems. It may not be as important as you're outdoors but it'll help you out in the long run, growth, bud production, trichome production etc.

lack of full light and overwatered slightly. Ph isnt your issue. Your plants will be fine for outdoor.