Yellowing

One of your problems is that you're using distilled water which is always a PH of 7.0 - much too high for cannabis and you now have some lockout issues. Start by getting yourself a PH pen or some other kind of meter that will accurately test the PH of your water! Then flush your plant using PH'd water (3 gallons of water to each gallon of pot size). This will set everything back to square one and you can then go forward with your normal feeding schedule... but ALWAYS make sure no matter what you give your plant it is PH'd to within that good range! If I had to change ANYTHING about how I started to grow, it would be to buy a PH pen at the very outset instead of relying on drops and trying to match the color with the chart they give you... Apera sells a really nice one that's just as good as - if not better - than BlueLab... Get SOMETHING that will give you a very accurate PH reading! You won't regret it at all!! As AsNoriu says, you should strive for a PH of 6.3 but anywhere between 6.0 and 6.5 is acceptable and will allow your plant to absorb the nutrients - and MICROnutrients - it needs.