I think the other guys got such big buds because he flowered from the start, which has kept the plants shorter meaning his light don't have to travel so far. You've vegged yours much longer and they've got taller and cfl's don't penetrate so deep. You could still veg for the same amount of time as you've done for this grow but next time look into LST to keep the plants shorter and get more budsites at the top of your canopy. That way you'll have a lot more cola's that are closer to the light that will grow big and juicy

Good luck!