Hah - I'm in the same boat. I'm just doing a test run with 2 plants in a 4'x4', DWC, @ 642w currently. I'm new to LEDs having used HIDs up until now. I'm planning on doing a journal next grow though once I have the 4 site RDWC system completely done for the tent.
I'm slacking this grow though. One of them is turning out to be a beast and always wants more nutrients than I'm usually comfortable giving (well over 1.0 EC already and it's just a few weeks old) and the other one is a super finicky grower that's relatively small and starts showing signs of overfeeding if I try to go above .5 EC. Glad I didn't try the two strains in a single RDWC system.