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TC's are just like any other lens, and can be off. I'd send the combo to Canon and let them take a look. A range of +/- 5 is pretty nominal and in spec. You have three variables in play with a TC.
The camera can be plus or minus 5, the lens the same and the TC likewise. If they all line up to the worst case, a error of 15 pts might be possible even if each part is in spec.
Also, the Camera firmware contains corrections for each Canon lens, its not a simple or straight forward situation.
Be very careful of your test setup, but I believe your numbers, so get it fixed.
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