All males.....

started 4, all males. What the hell happened? All were very healthy and grew very quickly (sign of a healthy plant). Are there environmental factors to cause higher male turn out?
FF soil, 5gal pots, plenty of CO2, temp stayed between 68-75 F

Help me out just started another round of 6 and desperately want at least 2 females.

bless,
my first hydo. plant was male i an i thought all was iry looked like lil buds but that grow to b lil seeds but i an i cuddy just left my green room an he has past grow ex. an he pointed to 3 of mine that may b male but ive always been told tall lanky plants are males an seeds do matter my friend used a over seas seed bank but i cant really tell

i have read that a light setup with more blue in the spectrum, increases the likelihood of female tendencies.
maybe throw a coupla 42w daylight 6500k cfl's in there for the extra blue light.