Auto Northern Lights in coco/perl

Day 22 - Temp 23.9*C (76.6F) 58% RH. Fed 1L @ 842ec, 5.72pH (0.4Ca, 0.1Mg, 0.6 Micro, 0.6 Gro, 0.3 Bloom). Got ~ 40% runoff (since I fed 1.5L yesterday). which is too much so I'll re-adjust moving forward. At this point I want to feed til 15-20% runoff to avoid salt buildup. Run-off EC 840 but the last few ml's came out at 800. A few hours before the lights went out I lowered the light to 46cm (18 inches) @ 80% power (should be ~ 418 ppfd). Day 23 - 25*C (77F) and 65% RH. I don't like the leaf deformity on one side of the 3rd set of leaves so initially I thought it might be a Calcium deficiency but now I'm guessing it's genetic? If anyone has any idea - let me know. Day 24 - 24.8*C (76.6F) and 62% RH. Fed the plant 1.55L of 900ec, 6.1pH solution. Got ~ 17% runoff @ 864ec which is a great sign that the plant likes the nutrient dosages since it's only slightly higher than the previous feeding EC. So far so good. I still think the plant is a little behind on size at this age which I think is a result of me stunting it early on. Plant is also ~ 7.5cm tall (~3 inches). Also, I increased the light intensity to 85% (~ 445 ppfd). Day 25 - 25.6*C (78F) and 59% RH. Fed the plant 1L of 940ec @ 5.81 pH. Got 20% runoff which came out at 913ec which is perfect. The plant looks a little pale though, I feel like it's not bright green like it's supposed to be. Day 26 - 28.1*C (82.5F) 55% RH. Had to move my tent for a day so environment got messed up. Plant looked fine though. Couldn't feed in the morning so I did it later. Fed 1L @ 1034ec 5.92pH (0.4Ca, 0.4Mg, 0.6 Micro, 0.6 Gro, 0.2 Bloom). Got 10% runoff @1660ec (I wasn't watering as much closer to the stem prior to today so the ec is higher because of that plus the temperature dried the medium too quick and salts started to build up). Runoff pH won't budge at all - Still @ 6.8 so I won't bother checking it anymore. Day 27 - 24.1*C (75.4F) 65% RH. Increased light intensity to 90% (~470 ppfd). Fed 1L @1037ec, 5.73pH (0.4Ca, 0.4Mg, 0.7Micro, 0.7Gro, 0.3Bloom). Got ~30% runoff @ 1261ec. Last bit of runoff EC came out @ 1110. Did some LST but the stem is so thick it's hard to bend it. Day 28 - Plant seems to be doing fine. Although I'm having difficulties with LST due to the stem being too thick and sturdy. It won't bend nicely. The plant is also short with big fan leaves which makes it hard for the light to penetrate to lower canopy. I'm hoping it will be easier to train her when the plant gets taller. Since it's my first grow I don't want to defoliate since I could stunt her even more. No feed/water today since the pot is still heavy (maybe 4/5).