-Is ventilation a major concern for plant growth?
-Does Nutrients/Food have a major effect on the buds?
-Type/# CFL lights for PC Stealth grow
Just running through my mind
Ventilation = Brings in fresh CO2, a breeze makes the plants stronger
Nutrients = Yes they are important, but it will grow with just straight from tap (I use nutr. ph down and let the water stand in dark for 48 hours to get rid of clorine)
The biggest increase in size I've seen is using Final Phase to flush - Gets salt off roots in soil then the buds swell and grow to 1/5 bigger in last 14 days.
I use Boost, Big Bud, Humbolt Honey, and Bud Candy during flowering - HOWEVER, I have no idea how well this stuff works - I do get great tasting herb with a good kick.
Keep your recipie simple as possible - Don't buy everything one company sells and use it. Reason, Some companies have a TON of stuff to use and if you ask them they would recomment you use ALL their stuff. It's overkill so don't get carried away.
I use a combo of LED, CFL, and HPS during flowering. CFL = You can pay a lot or a little - I got 23W CFL's for 25 cents a piece at a 99 cent store - Been using them with great success for 3 yrs.
Good luck