The wattage you are using has alot to do with it. This was grown under a 600. I had alot of air bud issues until i finally went with a proper light.
This nug weighed some thing like 3.2, well 2.7 after i pulled out a doobie worth. This is snowryder. My last jem had good density as well.. While the jem i left under the 400mh had less mass to the nugs for sure. Also pheno determined but you get the picture.