That's why I sent you a bunch. I was having trouble getting the DF to grow too. I'm planning on crossing the DF with my new Wedding Cake to make a better version of it. Call it DF2? Definitely try the OGK next. Very easy to grow. If those crap out on you or turn male then be expecting a new package with some different seeds. I will keep sending you something until you have some badass plants growing in there. I'm here to help.
I like your setup although you don't need both lights on right now! I would definitely go with the ceramic metal highlight bulb in at least one. those plants look really happy though keep up the nice job. I'm actually going to pick up me a ceramic metal halide bulb this week for my 4 by 4 grow tent, the one that I have the one gelato 86 in