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.
"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”
― Mark Twain
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?
"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”
― Mark Twain
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