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Every design engineering book and bolted joint guide that I have read states that the formulas for calculating torque values assumes that the threads are lubricated. I don't see how antisieze would cause you to put lugnuts on too loose, I think there is a greater risk that the nuts will be put on loose without antisieze because the friction in the threads could cause binding and prevent the nuts from reaching the true torque value that corresponds to the designed clamp load and stud stretch. We are talking about nuts and studs that have been used probably hundreds of times and in all likelyhood the threads are worn or galled beyond the original specs.
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