Howdy howdy ! your plants are doing well the only thing I can suggest is that you lower the PH of your water a bit , 7.2 is going to cause you to have nutrient lock outs your soil will get to hot and your root matt will end up suffering your ideal PH range is 6.5 at the low end and 6.8 on the high end ! I will follow along to check out the progress on these young ladies !
-Happy Growing!