Mr matics sour bubbly

Day 35 Just can't seem to get this one right , had cal mag def early on so introduced CAL MAG @ small doses which seemed to have sorted the deficiencies . But after a few days some leaves started dropping and clawing, so I flushed soil with about 15l and after a day or 2 they bounced back, I then checked calmag bottle and noticed that it contains NPK 2.0.0 so I thought it's gotta be that too Much N, and I'm getting signs of N TOXICITY. So I left all nutes out and watered again when dry and all looked good , checked this morning and plant looked ill again droopy leaves and clawing , so i gave a small feed of sensi bloom 1ml hoping Symptoms get worse so I could determine that it's def too much N , but it's bounced back again so I'm lost , something just ain't right 😫