Dinafem Sour Diesel AF - Soil

Bio Bizz soil plant: 36cm Garden compost plant: 40cm Plants popped lots of pistils and bud sites and started to stretch. I'm spraying with a 25mM calcium chloride folar spray in case of calcium lockout and considering pH testing (but trying to decide which ph meter to get). I chose a 25mM conc from this research: Efficacy of Exogenous Calcium Applications for Reducing Upper Leaf Necrosis in Lilium Star Gazer' The biobizz soil plant is trailing the other plant quite significantly and the lower leaves are yellowing. From the side by side pictures you can see it is darker green also. The garden compost plant has brown spots on some of it's middle leaves. Not sure what deficiency this may be! Thinking it could be calcium, manganese, or potassium? It also has paler leaves - I'm going to feed this one with slighly more biogrow. I decided against LST as it's my first autoflower grow. Any comments very welcome!