Help with nute levels

Hey there, I'm trying my first grow following stinkbuds system. Unfortunately his site lost most of the previous posts that I was using for info. On his forum someone had posted a way to tell weather to add or subtract nutes based on ppm going up or down in comparison to ph and ecs. Does anyone know this info or at least tell me what is an exceptable level for ecs. I was at 1750 ppm, 5.8 ph and 3500 ecs. A friend told me that the ecs were too high so I added water and am now at 1500 ppm 5.8 ph and 2800 ecs. Could someone please help me out and tell me what you look for out of these readings? Many thanks in advance.
 
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