Moby Dick XXL Auto Outdoor Soil

ElonMusk Start my diary as I have some issues and looking for help. I germinated 5 seeds straight into coco pellets seedling starter kit, that comes with a 3.5cm pot. Two of them popped out right away, two more just after and the final one at day 5. I gave them some sun from behind the window and sprayed with ph 6.5 water. Then i noticed the tap root appear on the biggest one so i transferred to their final 15l fabric pots. The soil was a mix of local organic compost 1/3, 1/3 coco coir and 1/3 perlite/guano organic soil mix, also lined the bottoms with clay balls around 1 inch. I watered them until run off a couple of days before transplanting the biodegradable pots directly into the middle. For the first 10-12 days I gave them only ph 6.5 tap water (left for over 24h + lemon juice to bring the ph down or vinegar). Then around day 12 they weren´t growing much and was told at the local grow shop to start adding AN Grow Bloom Micro at 1ml/l plus ATA Rooffast at 1ml/l. I gave them all 0.5 of each AN fert and 1ml of root fast with 1l of ph6.5 water, they were fine and then again after they dried out which seemed very quick (it can hit 30+ here in the day) i gave them the same, then i noticed 3 out of the 5 stopped growing and the biggest two did fine, I have sinced allowed them to recover only giving them ph 6.5 water for the last week when fully dried out, but they don´t seem to have recovered...the other two "big" ones are now at day 20 and still seem really small to me...any tips advice help would be greatly appreciated...

ElonMusk Only two seem to be working out so I am focusing on them. They have nearly doubled in height and getting a bit bushier. I started low stress training them a couple of days ago since they had 4 nodes, gently bent them over pointing to the North and tucked in some of the bigger fan leaves. I just took the photos today and noticed some tiny white piston hairs :/ does that mean its going to flower in the next week? They are still very tiny ...

ElonMusk First week of flowering/pre-flower week. Bud sites are appearing and producing around 5 or 6 heads now with the LST using metal pegs.

ElonMusk We hit 40 degrees on several occasions in the last couple of days, there was a massive storm yesterday and very heavy rain. I rushed home and put them under a table but the rain stopped not long after. I think the extreme heat has really stunted their growth...even though one seems to get growing very tall. What do you think their status is? How long until they are ready?