No. Let the plants tell you what they want. If they look healthy, no deficiencies, the ppm/pH are at equilibrium, then there is no reason to add more. The ONLY exception to this is for me, during a 10-11 week strain i usually add
a little more phosphorus and more potassium and a bunch of sulfur during weeks 7-9, and then i start to taper down the nutes for weeks 9-11 until harvest. One of my best harvests, with the smoothest, tastiest weed ive grown, only went as high as 650ppm during peak flowering and it was sill potent af. Less is more. Besides, adding more food than they need not only saturates the plant tissues but it also slows growth/bud development. Any time the plants have an issue with anything, the first thing they do is slow their roll. So essentially, by adding more nutes in an attempt to grow better weed, you can actually reduce the overall quality and quantity of your harvest.