looks good man. perhaps just slightly overwatered for the moment judging by the curling leaves in the first picture but it'll be fine (could be something else as well i'm no expert).
if it's bagseed i would say there's not a big chance they are feminised =P.
the closer you get the lights the better as long as you can manage the temperature, place your hand in between the plant and the bulb just above the plant for a while and if it's not much above room temperature then it's fine.
the plant is big enough and if they are 6-7 weeks old i think you should go 12/12 right away or in just a week and get a few more 2700ks
i think canna pk 13/14 is nutes for hydrogrowing? and i also think it's the extra phosporus and kalium nutes that you are supposed to add halfway through flower? so probably don't use that at all, canna boost should be fine though, it is also for flowering though i think
just to check, you are reading the actual wattage and not the incandescent equiavalent right?