MWS
Hereby the analyser shot.
I changed RGB values to your match example program.
so
RGBunits = 3
and
ledarr(0) = 128
ledarr(1) = 170
ledarr(2) = 85
Blue line comes directly from the Xmega pin, yellow line comes after the first led (DO pin).
In this case (with your default code) the third led on the strip lights up slightly pink in colour.
The other code which I started the topic with and for that matter older generation WS2801/LPD8806 led strips for example control led closest to controller first and so on.
I myself can live with it and just reverse the array but for the other way (closest led first) has sort of become the norm in Digital LEDstrip world I think.
Jim
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