I've noticed my plant is pretty low to the gr...

I see your are using calmag, Flora micro and Flora bloom. Although you may have a misunderstanding of the ratio you should be using. It appears you are using the 'Lucas Formula' however the ratio is inverted. The Flora micro:Flora Bloom ratio at full strength is 4:8/4L So that's 4ml Micro and 8ml bloom per 4 l. If your like to reduce initially in veg cycle you could go half that the first week or 2. Also now that the plant is bigger you can start to water often with nutrients everytime (you can do a flush before the flower phase if you'd like). Coco coir has a very good property of allowing plenty of oxygen even when the medium is heavily saturated. I run flood and drain buckets, and before I moved to perlite, I ran coco coir straight. I would completely drown my bucket for 15min with water then it would completely drain 6x a day...like I said, its hard to over water. But there is a catch though, coco coir tends to tie up calmag. I always used 1.5ml calmag/l of water. Hope this helps. I got 1.9 pounds on my last coco coir run I did and I ran that formula.