Here's a look at my veg room right now. Really pleased with how the little ones are coming along. A couple of observations from my digging into issues over the last several months:
1) Your environment is like 90% of your success; once I had my temps and humidity and air exchange nailed down, everything smoothed out and I can practically see them growing! No more root issues or deficiencies and whatnot. If you are having problems, take a look at your environment first and then take on any nutrient additions/deletions.
2) Take a close look at your nutrient regimen and see if there are any holes in there. For sure mine was lacking cal, mag and some other trace elements. When I really read the labels I could see where I needed to add some vital elements. By adding things like Calmag, H16 prime, or foliar sprays (I use H16 Foliar and H&G Magic Green, alternating between them) you can really solve some issues very simply. I really found they fill in a lot of gaps and my plants are so much happier. I started using it on this Bubba Kush clone as a test originally and she has multiple leaves that are over 7-8" long - and a trunk for a stem, she definitely stands out from her cousins - I call her Alexis because of her big bottom
Here's the whole group: