Good, your plants look nice, come to the right soil ph and they'll be in hog heaven! You're going at it a little different by mixing foxfarm and coco and I think the ph issue is the result. You already troubleshot your own issue I'm pretty sure.yes i did a slurry test on all 10
They will get big. You can control that. I switch light to 12/12 when they get to 1/3 height of the tent. After that they will grow like crazy for 3 weeks(the stretch) and may double in height normally. Some can triple but those are odd.