Extraction is not needed when vegging, good passive intake/outake is fine, my extraction never goes on till 2nd or so week of flower.
The 125 will be plenty for the 400w, thats what i use, and as long as you have a fan blowing in between the tops and the light, its all good.
I only ever use basic compost for vegging, and flowering, basic compost with added JI, perfect almost every grow, that way you dont have to feed, cause theres plent good stuff in the soil.
I pot up 4 times, and the last flower potup gets the ji version, veg for a couple of weeks and throw those babies into 12/12, the best yields are achieved when you wait for the pre-flowers to show before the flip. I only add food as such, i am 90% organic so my feeds will differ from yours i'm sure, at about 2 weeks after flowering has started, however before hand i add other goodies that I have worked out to improve things.
Check my diary for the full spec, its called 'Shared Grow' in the organics room.
You'll be fine just dont over fiddle and worry, its a weed mate, it grows like one, and it will take some abuse, serious abuse before they even consider giving up the ghost, patience is the real secret to a successful grow IMO.
Good luck feller, the world is your oyster, or your cannabis plant anyways
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