Should incres the EC?

Worth a try.. see how it goes.. don't just assess what happens tomorrow, but over the next few weeks or even a month if the formula stays teh same that long... rate of use vs rate of provision... if it is only slightly beyond what it needs, it will take a long time to show a toxicity... so, keep notes of formula and any adjustments over time, and always reflect back much further than you think is necessary. red in stems is different than red petioles (petioles are leaf stems). red petioles can be a P-deficiency... or it could be intense LED light hitting the petioles... if it's only at the top,. i'd chalk it up to the LED. I've tried far too many times to react to this and even tried adjust differentelemnts than P due to anecdotal nonsense i read. Never changed anything. So, i wouldn't boost P unless you see other coinciding symptoms of low p... like a blue-ish hue to leaves instead of a nice green. P is generally not useful above 60ppm based on proper research and not 'some guy in his basement,' but this can depend on the genetics at play, too. above 60 won't often cause problems, but when they test various levels and then measure what is found in the flowers, they can't find the excess P provided above 60ppm... law of conservation o fmass applies, so that means if it isn't in the flower, it's either unused elsewhere in plant or runnin down the drain wasting money and polluting aquifiers 10x more than necessary. red streaks in the stem can be a general lack of nutes or it can be caused by low sulfur. you want sulfer up over 100 ppm. i don't go much over 1.3-1.4 EC (fertilizer only not what my tap water adds). This works fine for both autos and photos with virtually no visible differences, if any.. I feed less now than i ever have before and still getting same quality of results and same grams per sq ft, etc... relative to genetic variety. more defintely is not always better, but at .8Ec i bet you could amp it up and realize some growth rate gains.. faster growth = shorter vege for same size plantas and that saves electricity, your largest cost by far.