Auto Northern Lights in coco/perl

First grow ever. It's going to be lengthy but all ideas/comments/suggestions/questions are welcome. Also I'm writing this about a week after planting. Hopefully this is going to help some rookies like me so that they don't make the same mistakes. Placed seed in a shot glass on top of a warm surface (PS4) for 18h. Used 1/2 RO water and 1/2 filtered water @ ~ 180ec. After 18h the seed was transferred to a paper towel. I kept the towels in between two dining plates on top of PS4 and re-sprayed with RO water a few times to keep them moist. After 39h in between paper towels the tap root was ~ 2cm (0.8 inches) long and I decided to plant it directly into the final 5gal/19L pot. About the medium - I've rinsed and double buffered a few cheap bricks of coco. First buffer was ~ 1500 EC of Canna Cal + Canna Mg for 6.5h. Second buffer was ~ 1250 EC for 9h. After the buffer I mixed it with Perlite. Total weight of dry coco was 1.2kg (2x600g). According to the coco label 1 brick is supposed to make 10L of substrate. Added 5L of agroperlite and flushed the medium to 330 EC but could not get the pH down so it was fluctuating between 6.8 and 6.9 (I might have messed up here since I was flushing with all sorts of fluctuating pH attempting to reduce it to 5.8-6.3. Also the flush was a combination of filtered water, RO water, Cal and Mag and pH down's. Sometimes I flushed with pH of 6.5, sometimes with 5.8, I might have even flushed with 4' something pH in attempt to reduce medium pH. I've pretty much been flushing for a day or two and been getting so frustrated since it wouldn't go down - first time grower here). Also, realistically, 2 bricks of coco that's supposed to make 20L/5gallons of medium made less than that after rinsing the small particles out. Furthermore, 5L of perlite should've been 40% of total medium. So now it looks like the medium is closer to 50/50 coco/perlite. I wasn't feeling like going through the whole medium buffering process again with another brick of coco (that I needed to rinse, 2x buffer, and flush to correct starting ec) so I just ran with what I made in the first batch. Placed the pot in a tent and turned everything on. About 9h later I placed the seed in the medium (which was still really wet from all the flushing just 9h ago) and put a clear water bottle on top as a dome. The tent was sitting at 21.3C, 50% RH. After planting the seed I sprayed 50-100ml of humic/fulvic acids (12% humic, 3% fulvic) + kelp extract (27% Ascophyllum nodosum if anyone's interested). The solution was 1ml/l of humic+fulvic acid supplement + 1ml/l of this algae, as it says on the label. First day the temps and RH were around 22C (71.6F) and 45% respectively. Light - Running at 30% power, hanging at 86cm (34 inches). Left it running the 24/7 to warm up the tent and to help the medium evaporate some moisture. 24h after planting the seed - temps and RH were ~ 22C (71.6F) and 55%. 48h after planting the seed (count as day 1 I guess) - seedling popped out of the medium.