I'd raise the ph to between 6.5 and 6.8 for soil. 6.0 is wayyyy too low. :thumbsup:

I use a 400w MH for veg. No need to reconfigure your growroom with CFL's unless you really want to. You just have to raise it a foot or so higher till seedlings are hardened-up a bit. But then again, I also keep clone mothers and clones in there at the same time.

4th set of leaves is a guideline, but not a rule. I start my seedlings on quarter-strength nute solution after third set is open, not including the cotelydons. (those round baby leaves)