Brown tips from bottom up

Long story short:the plant has grown and Is still stretching rating the lower leaves.I am doing a mess to keep Ec runoff higher.What I put in comes lower.ALWAYS.
What I did so far:

I tried to put more volume of solution by hand watering and It does seem to help increasing EC slowly.

The P deficiency lower continues to expand in older fan leaves climbing up node to node.
My actual EC in reservoir Is 1.7 and the runoff Is 0.950-990

My other plants showed sympotm but only in ONE leaf.The lowest.Those are different seeds strain and very lightfeeder,also smaller.
I run my drippers for 1 minute every 2 Hours for 10 times during 20/4H light cycle.

In One minute I get 200ml circa erogation and delaying 2 Hours the feed I get about 10-15% runoff.

Using Canna Coco A+B and pH down.
Tap water.

@vernal @MidwestMover @Foreigner
Sorry for tagging but I am going Crazy Friends.

Some pics:

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