dark/brow spots, papery apperance, leaf twisting

lmao..........

Are there time released nutes already in the soil though? Didnt you say, your using miracle grow soil?

no time released nutes
miracle gro potting mix
i do flush at least every 4 weeks

Here ya go http://growweedeasy.com/marijuana-symptoms
This article should help explain things a lot better than I can, and with good pics too.

Also, if watering with RO water, you do need to give em a shot of cal mag here and there as well bcs its removed in the ro process.