Auto Northern Lights in coco/perl

Day 8 - Temp 23.5C (74F), RH 56%. I can see it growing but slowly. Gave the plant some de-chlorinated filtered water @ 300ec, 5.9pH and 21.8C (71F) Day 9 - Temp 23.5C (74F), RH 58%. The leaves are not as green anymore so I'll feed it some nutes, maybe it wants some nitrogen. Fertigated the plant with 75ml of 475ec solution at 6.1pH. Solution consisted of 0.2ml Ca, 0.25 Micro, 0.25 Gro, 0.1 Bloom, 1ml humic, 1ml kelp per 1L of water (1/4 gallon). Plant seemed to like it and the leaves shot up. Day 10 - temp 23C (73.4F), RH 51%. New growth is visible. Gave the plant 75ml of Tri-Part solution (same as day 9 minus the kelp & humic) at 465ec, 6pH. Day 11 - Temp 24.1C (75.4F), RH 44%. RH lower since humidifier died overnight. Installed a new one mid-day. Growth is visible daily. Fertilized with 75ml @ 435ec, 6.14pH (same water from yesterday just re-ph'ed since pH increases overnight). Few hours after installing new humidifier - temp 22.3C (72F), RH 63%. Later in the day I lowered the light to ~65cm (25.6 inches) at 70% power - should be ~ 260ppfd. Light until now was hanging 76cm (30 inches) away from the plant and running at 40% power (Maybe ~ 100 PPFD). I feel like it's growing a little too slow and the height is still pretty stagnant. We'll see how it reacts to the new light distance and increased PPFD. Day 12 - 23.8C (75F) 39% RH in the am but went up to 65% in about an hour after a few adjustments. Fed the same solution from 2 days ago @480ec, 5.95pH. Day 13 - 25.4C (77.7F) 47% RH. RH went up to 70% after about an hour after adjusting again. Day 14 - 22.7C (73F) 74% RH. Sprayed around the plant 516ec @ 5.84pH in the morning. Medium looked dy by the evening so I fed it 570ml of 500ec, 6.2pH solution.