1st Grow - Mexican Airlines/Six Shooter

What we have in here are 6 autoflowering strains (3x six shooter and 3x mexican airlines) and 5 photoperiod (3x white widow and 2x moby dick). They were Germinated in coco pellets and put right away under a 600W HPS inside the grow box under a humidity dome with a RH of around 60% and temperature between 25/28 degrees. After around 3 days they were planted right away into their grow medium, which is peat moss with around 25/30% of perlite. I believe I miscalculated the size of pots, so the 15 liter pots in which the autoflowering strains are planted seem to be a little too shallow, so I'm thinking about adding some more earth to it, at least to give more support to the plant. Since these autoflowers aren't supposed to be planted for long, I am not concerned about root rot, rather more about the roots getting easily exposed on the top. There is 1 of the six shooters that had to be planted in a 500ml plastic cup and then later when more grow medium was acquired it was planted, at around 1 week and a few days old. This one is actually the shorter of all of them, which tells me that you miss out on size when transplanting. The photoperiod ones are by the way around 3 days behind the autoflowerings as they were germinated later. 1 of the bulbs is a dual spectrum and the other isn't, both by sunmaster. The dual spectrum bulb is over the autos. They were fed 2ml/L of Iguana Juice Grow and that is pretty much it so far, no other nutrients for now until they start flowering, which then I will switch to Iguana Juice Bloom and some Nirvana, so a completely organic grow. During the first weeks it was quite hard to keep humidity up by the way, the whole grow box (which is 2x2 meters) was packed with wet towels hanging, fans blowing on them, trays with water and a kettle which was used to bring water to boil and then let the steam try to raise humidity... terrible... until a proper humidifier came into play, then the only hassle became to fill it every 12 hours. Hopefully with time they will start generating their own humidity so the levels will be able to be kept stable without a humidifier. They actually even suffered some heat stress because of that when during the night one day temperatures went up to 36 Celsius and humidity down to around 30%, the humidifier came into scene immediately after that. What I've also been doing is cupping the higher leaves for around 1 or 2 days so the smaller leaves under can get more light. This has been working well so far, giving a even growth to all the leaves.