My First Time Ever Growing

Missed a couple weeks posting, life got busy and haven't been able to monitor to care for these plants like I wanted to. A lot has changed with these plants, they have grown quite a bit now and I have done low stress training to all plants except for the smallest, tho I have been somewhat training it by pulling branches down to expose them to more light, just not the main stem like the others. This week tho I have noticed quite a bit of problems arise, and not sure what it is, as the symptoms appear somewhat different in each plant, but all plants have had the same levels of nutrients. Growth has slowed on all plants. Plant 1 - The largest, growth still appearing but has developed quite a bit of yellow to it, with 1 particular fan leaf towards to top being significantly yellow, with both 1 yellow spot on a few brown spots on it, tho only on 2 fingers, the other fingers are less yellow more green with no spots. The leaves also are very droopy, and some of the leaves toward the top have clawing at the tips, tho not so much towards the bottom . Some fan leaves at the bottom have also started turning slightly yellow along the bottom of the leaf, with one leave having a brown dead tip. The first serrated leaves have also died and are curled up. The white pistols have started appearing tho, about 2 little hairs, a cm or so long. Plant 2 - seems to be better overall but has an even more troubling looking leaf on it, it's very yellow and has multiple brown spots on it, covering all 3 fingers. It's a bottom leaf, being on the 1st node, but only the 1 side, the opposite fan leaf has no yellowing or spots. Growth has somewhat slowed and leaves are droopy with a slight claw. Also the very top new growth, the small little leaves appear to be matted down, and are usually not pointing upwards like before. White hairs have started, tho some look a little different and twisty. First serrated leaves have also died Plant 3 - the plant that has had the least growth lately, with very dark green leaves and the new baby leaves on top have been super matted down. No yellowing, no spots I can see. The leaves at the bottom have slight clawing, but the newer ones at top don't. Very concerned about his one, because even with problems I have noticed some growth in the other plants, but not in this one. First serrated leaves dead. Smaller pistols then the others, can't tell if every node has them yet Plant 4 - the smallest of all the plants, as it also germinated longer than the others, tho weirdly maybe the healthiest, I have done no last to the main stem, only tying down nodes to expose them to more light. No yellowing or real dark green leaves, the new growth on top appears healthy and up, and no major drooping or no clawing. First serrated leaves still appear healthy. No pistols appear to have developed yet. All plants have been feed only maybe 2-3 times so far, giving them 2 ml of ph perfect advanced nutrients micro, grow, and bloom. Also have been giving silica boost every other watering. I only water about 1 liter between all four plants once a day, sometimes skipping days. Unsure of how much I need, and have only been watering when the soil looks very dry and the top soil is dry. I suspect I may have had too much light, and too close, so I have lowered the intensity and raised the height today. Was at like 700 ppfd about 15 inches about canopy I think.