Beautiful seedlings! I prefer to germinate on Rapid Rooters, I have used them in both soil and hydro, and have germinated with a close to 100% success rate (even when on the seed package showed a lowest rate) from papaya, strawberries, peppers, and of course MJ among others.
One thing I like a lot is that you just bury the seed and soak the little cubein water, put it in a dome and you just wait. It is really hard to mess it up. Moreover, the plants germinated in this cubes seem to be hardier overall in both soil and hydro.
I have popped 6 MH seeds so far, 5 germinated, 2 are females, 1 waiting on preflowers (already @ 39 days an no signs of preflower), 2 died because they couldn't get rid of the shell and I did not helped them either, and one never germinated because the shell cracked before I put in in the cube.
I will be doing a vertical grow also, but I'm waiting on some gear and finish vegging time in order to start the thread. I will be using a vertical 1000W Ushio Opti-Red in a RDWC.
Did you read my thread on Sexual Maturity? I asked some questions (still waiting on an answer) which should help people growing hazes and sativa dominant strains. If I have the time I will try to research (hands-on) more on this, since I plan on growing only sativa dominant strains indoors.
I'm pretty excited more people are going vertical. I already have another sativa dominant hybrid vegging vertical from a clone for a month and it is bushy instead of tall due to the position of the bulb. I have the bulb hanging in the middle of the tent and the top of the plant grew until it reached a little above the top of the bulb and then started to bush out and hasn't stop since, the vertical grow is negligible. I still have to go into flower but I believe vertical bulbs solves stretching issues, height limits, among others.