"The Wittelsbachs have a better genealogical claim to the throne than the Saxe-Coburg-Gotha line anyway..."
They're in my family as well as the Hapsburgs, the Dillenburgs, and the Hohenzollerns. Never knew until I had my DNA done that there was any German or Italian in my family. My DNA showed 35% Germanic Empire.
Which company did you use? I have had wildly different results from different companies, some of them very different from what I would expect based on genealogical research. AncestryDNA, 23andMe and FamilyTreeDNA have all revised the percentages they originally sent me, sometimes rather substantially.
In other words, the ethnic breakdowns need to be taken with a grain of salt.