I don't know what planet you guys are all living on...I have some pots that are 8 inches wide at their widest point at top, 8 inches tall (i.e. smaller than an American 1 gallon milk bottle), and they grow plants that are three feet+ tall. Maybe since you guys veg for 2 weeks and then start flowering you are limiting yourself. In the past I have vegged for 4 months and only then started flowering, but even 2 months vegging I have had plants 4 feet tall.
I have ficus trees that I bought in one gallon pots that are 5 feet tall in a small pot.
Have patience and don't be so quick to jump all over me just because I don't do things the exact way you do with 2 weeks veg, then flower 12 / 12 for 8 weeks exactly, no yeast/sugar CO2 set up, etc.
Open and expand your minds to new things, new ideas, and don't request censorship because you don't agree (whoever it was that complained about my signature). Marijuana smokers are supposed to be tolerant and open-minded, easy-going and cool, but more than a few here at MP are exactly the opposite.