Banana Purple Punch auto

Hello everyone. so the growth causes me some concerns from what I believe I have identified as a deficiency in calmag but I have trouble getting out of it despite a second spray with 1ml of calmag/li at ph 6.5. yesterday I watered adding 0.8 calmag/litre (biobizz) I'm waiting 2/3 days to really panic. on the other hand, the stems are really big and suggest a robust plant and the well erected leaves reassure me about the overall health. I take all your advice with great pleasure. thank you all.