Hearmenow,
Yeah, I agree, 3 months vegging! WOW, I have never, ever vegged that long.

In my own experiments I found little value in using a larger growpot, I can grow in a smaller growpot and leach with good, if not better results. My normal grow pot is 7"x7"x8"

There is absolutely no reason not to yeild atleast 2oz's per plant in a decent soil grow without resorting to using co2. More if you do use co2.

Maybe you should re-think your grow stratergy, and/or the strains you choose?