light movers are KIK ASS! you can keep a 1,000 watt light a couple inches from your plants and only need 1 light in most cases.obviously you havent tried 1.
If you feed your seedlings too many nutes then your plants will vera da millo on you.this is exhibit A so be careful with your nute regimen.This is also what happens when you cut on your plants while they are in flower :)
http://www.youtube.com/watch?v=T38EDKxrUts
it would be evecuated too fast and also a yeast mixture you speak of is a gnats WET DREAM! I make wine and gnats are always a problem as our flies and many other pests.mj grows great with just light,water,and air.give it a chance you will like it :)