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The key to getting them off in one piece was to get the the start right, peeling off a few mm so you have something to pull on. Then tearing it off at a 180 degree angle (flat) at a constant velocity. If the sticker got torn halfway I stopped and started at the other end of the sticker.
Like @Miitch says brakedisc cleaner will loosen most of the glue residue, enough to take it off with a cloth at least. Use a clean part of the cloth each time because otherwise you'll just smear back the glue.
Hmm yeah colours, I'm gonna put the 5800 parts on there and judge again :)
Nice work so far, how did you go about getting the decals off those quattros? I bought a set and tried to take them off but had to give up, the glue is something else. When I take the tyres off I plan to heat them with a hairdryer or similar to see if this helps. Anyone got any tips for removing some of the residue that's left behind?