The plant tells you everything... if you get deficiencies, you didn't provide enough. if you get toxicities, you provided too much over time.
If you fed well early, there shoudln't be much of a need to 'boost' things. This isn't foie gras. You can't force feed it or flip a switch to amp up its metabolism. Maintaining a supply of building blocks around the roots is our responsibility. the plant actively grabs the molecules it needs... if you needed a boost, you would have seen some symptoms by this point. bosting doesn't make fat colas... genetics does. can't put liptstick on a pig force-feeding it monopotassium phosphate, which is 90% of any 'boost' product... buy cheap.. these ingredients are commodities and do not come in varying quality. MKP is always MKP as far as effect. the molecular formula cannot be anything different and still be called MKP. (there are various options for ingredients, that's the most common)
Those 'organic' components you are worried about probably can't even enter the plant, so it can't really cause problems inside the plant. Just as you can't feed a plant glucose to supplement photosynthesis... there is no pathway to use that sugar even if it was possible for it to traverse root membranes.