yeah i'm pretty sure you need to use more "grow big" or whatever it is in the ff line that has more N.
and yes the alaskan fish fert will help, but it is very salty (fish are from the ocean). Most likely what has happened is since there wasn't enough N, there's now an abundance of PK, already meaning the salinity of the soil is high. The way I would correct this, is by giving it a leeching (3x medium size of water poured through) and finish the leech with a half dose maintainance feed with the new formula you choose, then slowly step into full strength over the next week or two
the plant might be locked out, and you won't want to do full nutes again until you see the deficiency stop.
deficiencies always start from the bottom of the plant, so if you see the bottom leaves changing to yellow, like on the deficiency chart, you know you need to add more N. Same thing for other deficiencies, just know WHY it's deficient in what it's missing and don't just go ahead and correct it; it could be deficient from a lockout due to an abundance of another nutrient or even a bad PH due to too much ferts being added (without being uptook)