With leaves that remain largely green but going yellow, then brown at the tips usually indicate over fertilizing. If you are giving fert with every watering, this needs to stop. Not only is it over-ferting, but at this point in the life cycle the plant is finishing, meaning that this is only an annual plant, lives at the most for one year, and dies naturally at the end of the cycle. Since you've been flowering for close to four weeks, it's apparent that the plant is just about done. You have good bud formation, or so it appears, which is another indication the plant is close to the end of its life cycle. Give nothing but water and if you want, you can harvest about one week or so from now, or just let the plant die naturally and harvest then. Most growers can't wait that long but it does give time for the plant to use up whatever nutrients are available and this tend to make for a better tasting product, or so some people think. About the watering, I wouldn't follow a formula like give so much water per unit of soil. Instead just water when the soil has dry out some. When you can pick up the container and it feel pretty light, then it's time to water. Drying the soil out allows oxygen to get to the root zone which promotes nute uptake. Keeping soil wet pushes air out and isn't the best thing for a grow. Also, I suspect you're using too much nutes as well, so I'd go a little easier next time and see how the grow goes. It's easier to adds nutes later than to remove them.