Sometimes "feminized seeds" aren't always feminized. Ive heard people talk about seeds not sprouting or getting male "feminized seeds" ....also some people breed the males.
Not sure but it sounds like your trying to pump 1000 watts into a 600 watt bulb....if it doesnt burn out on start up it will make the life much shorter...i wouldnt try it with anything i own
Cloning will take longer the longer the plant was in flower. It takes them longer to root. But if you get a flowering clone and cut off 80% of the top bud that was forming i here that you will have many many tops.