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I've never had an N tox in flower with Masterblend. I like 3 grams MB, 2 grams cal nit flower week 1-5. Week 6 is 3.6 grams MB, 2 grams cal nit. Week 7+ is 3.6 grams MB, 1.66 cal nit.
If you're adding MKP, I'm surprised you're not locking out magnesium with all that potassium.
No issues with magnesium yet but I’ll definitely be on the look out for signs of lockout. I only add 1/4 teaspoon mono potassium phosphate 2 times per week. the strains I grow could be more sensitive to N.