Lil' Advice?

Hi firstly, since i'm new around here
need a little advice... i'm doing my first grow 5 plants 2 unknown strains , 2 AK47 and 1 superskunk under a 600W HPS system these 2 picticular (unknown strains) are my cause for concern, pictures will be below but basically the leafs are curling downwards and looping and im just wondering what the cause of this is? i'm under the impression its from overwatering but not 100%, my medium is about 60% John innes all mix soil and 40% perlite there were 3 and a half weeks old.

at the beggining my watering habits were quite frequent as time pregressed i managed to get it under control and i water about every 3 days my grow area is compact and an electric oscillating fan is my choice of ventilation for now.. no nutes have been used as of yet anyways here are my babies

pic #1 this is unknown strain B and as you can see a few leafs curling down and looping

pic #2 better pic of strain B's leaf, only 3-4 old and new of these leafs look like this one

pic #3 Strain A besides that 1 leaf on the right that is slightly rolling at the sides theres no obvious problems

pic #4 finally my babies in all there glory
(i'm aware they were all planted at different times I do have a plan tho, just need to wait for the next few pay checks to finish my vegging room)

anyway all advice comments is appreciated glad to be apart of the community and thanks in advance!

i'll give a try, but this is not obvious. 40% perlite would make over watering a bit less likely
that and your others look good, tend to make me think it wasn't over watering
usually, plants will recover from over water and spring back, unless it went on for quite a while
not sure what a chronically over watered plant looks like, dead most likely
a bag strain makes it a bit tougher, it looks, well, a bit 'odd', but not really unhealthy, just strangely shaped

possibly underwatered? or just genetics maybe? neither were bagseed i bought 10 Ak47 and 10superskunk from what i heard was a respectable seedbank and they threw in 5 random freebies which are those unknowns aslong as they look healthy tho tis all that matters I just wanted some opinions off the pro's since this is my first grow and on my own its hard to judge what "healthy" looks like, more so because i don't know what strains they are to find refrences

anyway thanks for the input!

i'm no pro, though used to do a lot of outside grows, just doing my 1st inside grow
i'm not sure it's healthy, could be
the newer growth looks better, so if there were troubles, you may move on past

i think the taco looking leaves are from light too close/heat maybe ?