in dwc id usually feed to a max of 1.2 - 1.3 EC in the later flowering stages and last two weeks i ripen and "faux flush" by diluting and lowering ec to like 1.0 to 0.8 range.
i think it may change for different mediums. ive heard of some psychos feeding at like 2.0 - 2.3. thats probably some outdoor grow or something cause in dwc id absolutely fucking toast any plant.
Less is more mate. I rarely go over 1.2, but have gone as high as 1.7. Depends on each strain and how they take the feed.
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Yes mate i would agree 
As long as the run off is coming out around the same ppm as its gong in your should be ok. Have you tested run off?
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