It's always truly difficult to really tell what the paint is up to in those old low res pics. I am no expert, but my brain says they didn't start with a pure white 109 and added grey stripes. What my eye, for what it's worth, sees in the pic is a normal 109 scheme over painted with large bloches of white paint leaving the underlying camo showing through in those greyish areas. It does not appear to me to be grey over white, it looks like white over camo with no grey. Just my .
Your work looks great so far.
BK