I'm using 20 oz containers for relatively large plants, and I also hand water with a mild nutrient solution once a day (I live in a dry environment and they need it). I avoid wasting supplies whenever possible so my runoff is usually around 10-20%. I need to flush with filtered water at least every 3rd day, and I think they may like to be flushed ever day. If I let it go 5 or 6 days before flushing out leftover salts from the nutrients, the leaves begin to discolor and burn like yours (not as bad, but I'm quick to flush before it gets worse).once a day. they are in fairly small 4"x4"x5.5" square pots. Let me ask you this. As of right now I am only using Cal-Mag Plus, Pure Blend Pro Grow and Liquid Karma with RO 0ppm water and all added in that order. What is the recommended ppm of Cal-Mag Plus that i should be starting with? Seeing how I can't go off what the bottle says or else I start with 450ppm water!!!
If you're SURE you don't have a PH issue (it looks a little like low PH burn), cut away the end of the leaves that are burnt so it's easier to tell if you're making improvements and flush right before you water every day for a week or two. If the daily pre-flush helps your plants, something is obviously building up in your coco and killing your girls.