Curled leaf tips, odd colors?

Wow your VPD is crazy high. That means your plant is transpiring at a massive rate. VPD is the measurement of vapor pressure in the leaf, as it relates to the vapor pressure in the air (air humidity) With a 78F temp coupled with 30% humidity, your plants Stomata are wide open and cranking up the water and nutrients at a rate that is too fast and can cause excessive nutrient uptake which can lead to toxicity in your plants, and can deplete nutrients in the soil much faster than necessary. Your relative humidity in your space at this stage of growth and at the room temp of 78F your humidity should be up around 70% NOT 30% Get yourself a humidifier, or dump water on the floor of your space. You can roll up a towel and lay it along the edge of your tent and soak it. You can leave a tray in there with water, like a baking sheet or something. The more water surface exposed to the air the high the evaporation rate. Next feed i would do a 400ppm mix at a 6.2 pH The other thing is the plant in question looks like it's suffering from light stress. Back off your light a bit with a dimmer, or just raise it a foot. There is such a thing as too much light and it can cause your plants to bleach white and yellow.