Hey firebloom, sounds like you've done your research. You can add a couple of the 2700 bulbs for veg, they stretch more with 2700 bulbs but if you have a ratio of 2x6500 to 1x2700 you probably wouldn't notice any difference. Can't comment on the soil, it's not something i know much about, i use bio bizz soil and that seems to work for me, i've heard to stay away from miracle grow soil tho as apparently the ferts in it burn mj plants. Good luck and keep the updates coming. I've got a grow thread if you wanna check it out, it's at http://boards.cannabis.com/showthread.php?p=1031455

Peace :rasta: