Hi,
I am surprised that you got a rectangular map to do that on a sphere at all, let alone
get it accurately. One of the reasons that there are so many different Projections of
Flat Maps is the difficulties with distortion, particularly around the edges. They do
not often replicate the same as what is on the equivalent sphere.
A Decal "should" drape and wrap around the shape that you put it onto so if you managed
to get an accurate end result then you either measured and placed extremely carefully or
you managed to fluke it. It is a shame that a Decal must be a flat surface with no cut outs
as there is one Projection that literally peels off the surface of the sphere but leaves huge
gaps in the end result at the top and bottom. I cannot remember what it called but it shows
the surface with accurate size so Africa is the Enormous sized Continent it actually is and
not the usual projection that distorts it to make Europe bigger. It just isn't terribly useful
for practical purposes like plotting onto anywhere except the middle. To give you an example
of distortion of maps, most of Europe actually fits pretty much on the Australian East Coast
to the NT and SA Border. Roughly equivalent from the US East Coast to the Mississippi River.
Australia and the US Mainland (not Alaska) are almost exactly the same size.
I have only just returned home and not had time to look at your file but will have a look
tomorrow (it is Late in Australia right now). I suppose that the wrinkles from the distortion
of a flat map cancel each other out when fusion calculates what it would look like on a sphere.
Cheers
Andrew