cupping is over-fertilizing.
waterlog will be a massive droop plant-wide... like the lights were off.
don't mist the plant. leaves don't function that way. Water for a bit of runoff, as that will prevent buildup. You don't need fertilizer for a see for a couple weeks. i am not familiar with your soil, but it may provide nutrients beyond that too.
you'll want to wait for a slight slow down in growth or a hint of yellow before beginning a regular feeding schedule. small plant = small appetite. allow top 1/2-1" of soil to dry before watering again - fully, if the pot matches plant's size. If pot is oversized, water a radius around the plant and continueally water a larger area as it grows. edges will dry out, which can be a problem, may want to moisten that as rarely as you can as to not deprive small root system of o2, but if it gets dry as a bone it'll start to repel water to some extent.