What is happening? Coco drip 2nd week flowering

Last week i have put them into flowering after some power failure, also since then i have had some problems. I started in the grow cycle with some leaf problems, the cause was not enough nutrients. Now i have a leaf problem again.

So to solve the first problem jumped up in nutrients and everything looked fine, except for 1 smaller plant which was staying behind and still is. The problem showed first by some drooping leafs and more yellowish leafs, later i saw leaf tips folding down and up. Now i see yellowing/browning at the leaf edges. Eventually it showed on my other plant too.

So after i realized the upcoming leaf problem i tried to find out what was wrong, i balanced my ph meter again, flushed a bit and then started with low nutrients again (half strength of what it was). Now my question is what is the problem? I guess i'll have to know soon because its starting the flowering cycle..

Is it overfeed, not enough or what ever?? It is my first time on coco so i am a bit carefull.

The dripsystem is quite new too, i installed this just before starting the 12/12 period.

I also tried to water more or less to fix the problems, can maybe tell me what is the best with this?. The plants are in 10 L of coco..

My new starting growjournal is to be found in the journal section.

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simply said:
2nd week of flowering
dripping till run off 2 times a day
2.5 ml hesi coco per lite/10 ml - gal.
ph 5.8
10 liter/2.5 gal pots

that looks like it needs some magical, I would say it is a magnesium/calcium defficiency, Just my guess coco has a reputation for going def. Add in some dolomite lime or just some magical. I use coco also and have never really had a problem like that before. I treat my coco like soil and only water once every few days and get awesome results, I would say maybe a build up problem but if you are watering that much there has to be runoff sooooooo..... Try some magical.