Nothing to worry about at all. Although I do too! If the casing doesn't fall off be extra careful helping it off......that is delicate (Yup! Killed my first like that!)
my veg. is 24h cfl ,i seem to get a more aggresive growth putting into flower room when i veg 24 maybe its cause the girls just got there first nights sleep in over a month.
I would. I would start with 4" like you have it now and lower it slowly. By the time the second set of true leaves have grown out a bit the light should be about 2".
I agree with what others have said. You don't have a problem now. She looks normal. But when the leaves appear she will reach for the light. At this point some seedlings stretch so wildly they cant support their own weight and the long skinny stem is very vulnerable to 'damping off' fungus