Hello!
To your first question I have no answer (wondering myself every time I do my walkaround!).
Further are the wingfences on the outboard leading edge of the wings of any aerodynamic value?
They only serve the purpose of preventing glare from the lights in the outer leading edges. Some 500 series Citations (e.g. the 560 Encore) have real boundary layer fences, but these are positioned about midwing and reach far deeper into the wing.
Regards, max