I keep looking at the points raised in this discussion and can't help returning to the thought presented by the proposed OS-liste scheme (issued in Sept 1944) for the Bv 155 which states:
"...The fuselage sides, side of the vertical tail and
leading edge of the wing and horizontal stabilizer
should be painted in colour 76. Hereafter, except for the wing and horizontal stabilizer’s leading edge, the aircraft should be then in a cloudy overspray with colour tones 81 and 82.
Also, we look ahead to simplify the paint schemes which we should know shortly and will publish. Afterwards, the above mentioned aircraft which will be used for day service,
camouflage on the undersurfaces should be deleted..."
(Quoted from David E. Browns Excellent article,
http://www.clubhyper.com/reference/luftcamdb_3.htm, published on Hyperscale.com)
The bold highlights are mine to emphasise my point - perhaps a similar order was issued for the Fw 190D?
Just my thoughts on the matter,
Chris