Full strength is never a good idea it will almost always burn your plants especially younger plants. I always start out quarter strength and increase each week until I reach my target. I use primarily Advanced Nutrients and its almost impossible for me to use full strength base. Additives that don't have strong NPK can usually be used at full strength.
Different nutrient lines run at different PPM. I have used Cutting Edge and ran up to 1800 ppm in flower. I have never been able to run 1800 with Advanced.. both applied to the same strain. My two cents on it.. Quality nutrients contain quality ingredients that your plant will uptake at a rapid rate. You run at Low PPM… shitty nutrients contain poor quality ingredients and your plant can't uptake half of the nutrient solution allowing your plants to run at a higher ppm. I don't know how much sense that makes, its just what I think, so input is welcome. I got nice results with Cutting Edge, so Im not saying its a bad product, but AN wins for me. … but yes, gets PPM reader and your way better off then guessing .