Always keep a keen eye for dead and dying leaves, you should be sure to pick leaves that are 70% yellow or more. It wont stress your plant at all, if anything you lightened it's load, they were nothing but a burden to the plant. Old foliage can attract spider mites and fungus (mildew). The seedlings are definitely too far away from the light, I would go ahead and move them all inward about 6". Right now you are in danger of running out of space around the walls of your grow tent. You want to make sure there isn't any wasted light in the center when your plants are matured, that is where the very best light is. If you waste some space on the outside of your light footprint it is no big deal, that is the weaker bit of light anyways.
Fem seeds can herm, but it requires a good bit of stress and it all depends on the stability of the plants used. Just don't do excessive pruning, if you need to clean them up real good, do it over a course of a 3-4 days, or even a week. Be sure that they stay on the same light's on time when you switch to 12/12, big gaps between lights-on from veg to flower can stress plants. Be sure your timers are in a safe location and have either a battery back up or are digital, because if your power goes out, they get set off whack, and you have to remember to correct them or else your plants suffer. Stay away from strong pesticides that could leave a waxy residue or cause malformed leaves, like Safers Soap.