The auto ak-47 is suppose to be a larger auto flowering strain. They are suppose to grow up to 2 feet in height with some bushiness. The breeder does recommend 5-7 liter pots to grow them in so 3g shouldn't be a problem. I'm growing my first grow of this strain and mine seem awfully small too mine are three weeks old and maybe 3 inches tall. Did you find that your new light set up made any difference? I am using CFLs on mine.