Please help with nutrient deficiency problem

Here are some pics of my plants…about 7 weeks from seed…in soil. Soil ph is 6.0 to 6.5 between all plants. Using Fox Farm trio for the first time and following their feeding schedule to the tee. These pics are lower leaves but the upper leaves are looking a little funny and even the lower baby leaves right off the stalk are looking like this…from what I’ve researched it looks like phosphorus deficiency but I’m not sure. I’ve played with nutrient strength and tried flushing but I can’t seem to correct it. I’m thinking about going back to General Hydroponics Trio…I never had this problem with them before. What do you guys think?