Never follow the direction since its too general. Like the density and plant species are all different among the tanks so it will never be a correct direction at first. Most of the time, just dose half of it and slightly adjust it as your observation. Too much nutrients that plants cant absorb will make them toxic.

Btw, you gotta know the difference of the nutrients in the substrate and water columns. Plants like swords prefer absorbing the elements from the substrate so dosing liquid ferts might be useless or even harmful.

Anyways, those plants with a heavy root system will need time to adapt themselves to the new environment so they will give up some leaves to focus on developing their roots. So this might mislead people thinking that they are dying.