cure for nitrogen deficiency in flower?

im 3 days into flower and i noticed several of my plants have a nitrogen deficiency which i expected as i had changed the nutes. would it be better to use 1/2 tablespoon 18-18-21 and 1/2 tablespoon 12-55-6 per gallon of water? superthrive is also added.

The 18-18-21 seems like it would do the trick.

The average hybrid is still vegging 2-3 weeks into flower. You need to treat it like a vegging plant with a high nitrogen nutrient until you see the outline of the final cola... before they actually start to fill in. Then switch out to a low nitrogen/high phosphorous nutrient. If you don't keep the plants green a few weeeks into flower, your yields will suffer and since the plant can't keep itself healthy, it will become even more stressed and diseased.

its very minor but i noticed it. ill just give em 18-18-21 for a couple weeks