You done good with the super soil man. But the tap waters got to go, there are all kinds of minerals and chemicals in that shit. My best advice would be to get a small tarp and a 30–50 gallon trash can outside and collect rain and use that water, I promise you it will be the best water you have ever used except for maybe RO water that stuffs amazing.  

but for this plant you could give some recharge or a compost tea and feed it something like a liquid organic fertilizer, don't use any dry kind cause that stuff takes to long to break down for where ur at in flower.