@MichaelAnthony,
1. Good soil to use, pretty much you could use JUST this alone and would produce good results without having to add anything else to feed it.
2. I would lay off nutrients right now
3. Fabric pots are good, I use 5 gal myself and have never had an issue...try the Vivosun bags, they work well :)
4. I would water every other day, keeping up with your finger regime.
Solution: 100% stop using tap water as it's treated every 4 hours. Chlorine is a huge culprit with using tap water as it's literally going to burn your plants...I use spring water or rain barrel water :)
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