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You dont need to lower your torque values. Im not sure why people think if you lube the threads you are making the bolt tighter??? you are only making it easier to get to that torque setting. And you are also protecting agianst any corrosion especially you salt guys.
At the end of the day people can do/ think what they want, but IMO if you use grease or oil on all the bolts that hold your motor together (or anything together for that matter) you will have a more accuratly assembled engine. its that simple.
All that said, i agree if yor just doing up a bolt by hand, yes you COULD make matters worse with a lubed thread, as its easier to go too far. But you develop a "feel" for it over time. You gotta fight the urge to crank on bolts, especially cuz all our bolts are so small!!! A GOOD torque wrench is key.