many people claim flat white paint is the best for reflecting light.... it's easy/quick to apply and is cheap
can't advise on the light distance as I'm not familiar with large CFL bulbs, but I keep my 600 w HPS about 10 to 14 inches away
they say put your hand on top of the plants and if if feels comfortable then it's likely okay for the plant, if uncomfortable for you, then too hot for the gals
BTW: did you see my edit about your electrical cord...remember electrical safety has to be your #1 priority, everything else is mice nuts