I am using basically the same soil or rather soilless, my ph is a little lower run it around 5.8 to 6.0. If you are using a soilless medium which it sounds like you are. Mines 75%peat 20%perlite and 5%lime and has no nutes at all. If this is what you are using for a medium go with the lower ph cause you need to treat it like hydro. Do watch cause as the peat disintegrates it will change the ph level of the water you are adding. I check my run off every now and then to make sure im in range. I just wouldnt and dont reuse medium after a grow so the peat decomposing doesnt really affect me, just dont keep reusing.
I have been nuting since week one with mine using FF Grow Big and Big Bloom at 1/4 strength and i havent had any burn and my girls are lookin good. Have been upping it considerably seems like FF doesnt burn plants that quick. My Opinion.
As for why it looks a little strange that is normal and does happen. I have had several seedlings start out looking very deformed. I believe it has to do with storage of the seeds or the seed condition or a natural occurance. However dont fear, from everything i have seen, I have always let my deformed girls go and mine have eventually rightened themselves and now 4weeks later you cant tell which had the problems. Out of 13seedlings 3 had some serious deformaties but now look beautiful.
I also tend to not like misting plants. seedlings once sprouted are takin in water through their roots so their good. The mist tends to stay accumulated on the leaves as it looks like in your pictures and can magnifine the light coming from your bulb and burn the leaves. I have seen this a bunch from top watering plants and spilling on the leaves. I now keep a towel with me to wipe them down and make sure the leaves stay dry. IMO.
Hope this helps, Good Luck and have patience