hey,
your setup sounds good. I would say, that u should do 18/6. In my opinion it doesn't really makes any difference. 24/0 or 18/6. I have few grow/flowering rooms and there are 24/0 in one of them, 18/6 in the other and 12/12 in the third one... and the reason I have 24/0 is just cuz I don't have a third timer LMAO
what's up with ventilation system? is there any air circulation in your growroom?
don't straighten up your seedlings. they gonna do it themselves. in fact, be careful with your plants. they easy to damage while they so small. keep your CFL's as close as possible. then your plants will grow bushy and short. I guess 4-5 inches is perfect distance.
good luck.

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my NL grow: http://boards.cannabis.com/showthread.php?t=82324