Possible Popcorn Buds?

BIt to early to tell if they will be popcorn nugs, need to give them time to grow. To avoid smaller larfy buds you can strip the lower buds that are not in the canopy something known as lollipopping. Or add in side lighting to help them get the energy they need. It looks like the leaves are also curling up at the serated edge and I tend to see this with heat stress on the plants, the tent is at 31c and 70%RH in your diary and its the upper limit of temps and over limit on RH for budding plants IMO. If you can try and lower the temps to around 24-28c and the RH down to 40-50% you should find they will droop less. Keeping up good airflow is key. I'd say the PH maybe a touch to high as well but the plants look to be doing good with it. So I don't think you need to worry about that. Look up something called VPD. its a chart that helps you find some sweet spots in terms of temps/RH I think this could be a good tool for you. as well as a EC/PPM pen to determine the strength of your feeds. Best to dilute it down to the desired EC/PPM but keep the same mixing ratios. Good Luck!

Your plants look way over fed. Too much fertilizer during flowering will cause excessive leaf growth rather than bud growth. Are you watering to run off each time you irrigate, if not, nutrient salts will build up in the coco and this might explain why your plants droop after feeding. With coco, you should be aiming for approx 20% run off each time you irrigate to prevent salt build up, which can lead to a toxic conditions and even plant failure. Irrigating with less than half a gallon in 3 gallon pots might be the problem. If there is a build up of nutrient salts in the coco, this would show up as over feeding, as the nutrient become concentrated in the coco due to lack of run off. Flushing your pots with plain water then making sure you get decent run off each time you feed in future, may improve things. One thing is for sure, you should not be getting "leaf downturn" each time you feed........unless there already is a massive build up of salts in the coco.