Anyone have any idea?

So this is my 3rd grow, first time growing an auto.
Grim reaper auto 8 weeks from seed in dwc using green planet dual fuel line.
pH has been dropping to 5.6 in the last few days and the ec has been 1.6- 2.0.
Temps stay between 19c lights off and 24-26c with lights on, humidity 40-50%.
Res temp 20-22c on average.
2 X air stones.
This has been on and off for a few weeks now, first I thought cal-mag problem and then Phosphorus! I up the cal-pro and the pk and the spots on the leaves slowed and she started growing again.
A week later it come back but much worse!
Has anyone ever delt with anything like this and what did you do to get her back on track or an I fighting a battle I can win?
 

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