totally get the unlevel floor thing. i can 'zero' the camber gauge against the floor, but don't think the cars response to an unlevel surface is equivalent to how far the floor is out (ie, a floor that slopes .5 degree in one direction doesn't mean that the camber is .5 degree higher on one side and .5 degree lower on the other).
at the same time, after futzing with it and seeing how crude camber adjustment really is - just three studs in a slot (not to mention any wheel variations) - .5 degrees is really your margin of error - be happy if you can get the two sides within that. any shop that gives you an alignment spec to three decimals of accuracy is just playing you.
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