1. There has been a lot of growth this past week. It makes watering and feeding difficult. She is growing rapidly enough that you think feeding would be fine, but her roots aren't developed enough so she can't take the water and nutes in any real quantity without showing symptoms of over-watering.
2. My solution has been to water at 2l, but only about every 4 days. I feed at 25% strength every 3rd watering. I also mist with a 25% solution every other day. As long as I let the soil dry out between waterings I should be fine. I notice the leaves really perk up after the 2nd day.
3. Since she is a quick grower, I'm considering topping her. I have to get the watering under control first though.