Just my 2 cents, but I am new and ran into similar problems.

Get the RO water from your local hardware or grocery store. It works the best and its not expensive. Listen to Zandor about CalMag.

As far as what you have your PH at...

5.2-5.5 is WAY TOO LOW> I dont care what anybody says about this at this point. I am on grow 3 and when my PH was 5.8-6.0 plants were healthy as an OXE! When they were 5.5 or 5.4, then were DYING. 5.2 is WAY to acidic for what you are trying to do.

Go get Jorge Cerventes' grow book too. Local book store WILL have it. Dont buy it online...

PEACE!