What to Do About N Toxicity

Hi everyone, noob grower here and I'm pretty sure my plant is showing early signs of a nitrogen toxicity because I saw these same issues in a previous grow and an experienced grower identified them as N toxicity. Specifically, I'm seeing a couple leaves claw and other leaves are curling sideways and are showing crispiness/brittleness. My question is, How do I adjust my feeding regimen so that I lower the nitrogen without throwing off the other nutrients? I'm currently using GWE's recommend feeding guidelines for this plant (Barney's Farm Tangerine Dream, Week 1 Veg nutes). pH, temp, and humidity is in range, no root or other issues...pretty sure this is related to my feeding regimen. Growing in RO water with CaliMagic and the Flora Trio. Do I feed less with the CaliMagic or, say, the Flora Gro, because they are adding extra Nitrogen? Or do I use the same proportions of nutes but just back off overall? PPM currently at 670, which might be high for this early in vegetative stage, though I would think that I would see signs of nute burn if there were too many nutes overall. PPM level has remained neutral over the past couple days even though the water level appears to be dropping a little, pH drifting slightly up. Thanks!