So Markass have the others sprouted yet?

Instead of 18/6 give 20/4 a try through out veg cycle. Then a week before you switch to flower take it down to 17/7. Then go to 12/12 to flower. If you are going to follow the cycle of life growing technique that works very well. The environment in the 3rd to 4th week of vegetation is when the sex is determined by the plant so control your total environment for that period very closely and you will have a better change of producing girls.