6 weeks into flowering. Too much yellowing?

plants put on most of their weight in the last 2-3 weeks. i agree with adding a dose of grow nutes. rather than flushing, why don't you just cut your ppm's in half. your girls don't look like they need a hard flush. try reading this first- https://www.rollitup.org/t/the-truth-about-flushing.409622/