How often are you doing water changes and are you taking the ppm reading from the reservoir or the solution your adding, you need to do both and weekly water changes or at the least fortnightly also what's the water temp of the reservoir, try to keep it around 18-20 degrees and you have algae growing because it's to wet and high humidity try lowering the water level. I looked at the nutes your using and I don't think it needs any cal-mag yet at this stage the other nutes have enough in them and for DWC raise the ph a little bit, I keep it around 6.0-6.2 if the ph gets to low in DWC it will effect the growth. I have grown Big Bud auto before in DWC check out my diary, Cheers Dan
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