I personaly would give them some more heigth before cloning. I wait till I see sex, till I clone, but I never purchased feminized seeds either.
They look very nice. Probably a silly suggestion, but 4-5 years ago, I figured out I could elevate my box, then I cut the floor out so I could *sink my medium thru the floor*. My hydro runs, were WAY cooler!! I think even the tubs I used ProMix in benifited from the cooler medium temps. Not all set ups allow for that kind of radical effect tho.