Then what you need to do is get a microbe product and use a tiny bit once a week or two weeks so that you know you have a robust population of microbes in there working for you. Microbes break down the organic material and make it available to the plant, and this takes time for that to happen.
A little kelp in veg through week two of flower and humic acid through the middle of flower should/could be added to that 5/3/2 with the microbes (every two weeks) you shouldnt have any deficiencies per say and should get you to the finish line.
Theres just so may ways to do this but you're going to want to get a microbe product doing it organically.