To control a normal map's power in Maya, use the "contrast" node. Pipe normal map alpha output to input.X of contrast node, and output.X to bump value of bump node.
Gets a lot of bang for your normal map buck at the default multiplication of 2, but dial down as needed.
(UPDATE: After the contrast node, go back into the BUMP node and adjust the value. The control seemed to have done nothing before, but seems to become obedient again once you slap it with the contrast node.)
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