I dunno for sure but it may be too much too soon. In the past I have found that allowing my plants to remain under the flouros with almost no food until they fill the cup with roots always gave me better results. The only thing I can see that doesn't add up is a small root system . They aren't going to need that kind of food and light yet; they cant use it. I may be wrong but then again those girls may just like a different kind of attention/setup/grow style..The mix is great and seems rich, maybe like too much icing on a cake.