I will guess that your high percentage of females may be due to a low stress environment you had them in for the first 3 weeks. I hope mine turn out the same. I have eight White Widows going right now and I only need one to be male for some extra seeds

If you have a dark spot to put the plants. You can rotate them. You can run the light 24hrs with 12hrs for each set of plants. That's the only thing I can think of since you don't have any more room under those lights. Good Luck.
Check out my thread "White Widow Pic". You can see I can easily house your extra plants
Pass That Shit Reviewed by Pass That Shit on . is this plant hermie? this plant has been in 12/12 for about 10 days and just started showing sex. a little ball (only one!) appeared at each internode about 3 days ago and i was almost certain it was male. i waited a few days just to make sure and now i see that little white hairs have popped out in a few places. i'm not sure whether it is displaying both male and female features though! i tried to get a few shots showing one side of the internode showing a hair and the other with a ball (i remember the first Rating: 5