Critical Purple Kush DWC

One of these might be a weird phenotype? Rounded leaves instead of serrated? Kind of strange but I like it. All my girls perked up after being a leggy second week. I am worried they might have too much PPM but based on the General Hydroponics feed chart, it isn't too much. I didn't put in as much CalMag as I'd had hoped because I didn't want to get too high in PPM. When should I top for the first time? My first grow, I feel like I topped too early