You mentioned you were rural, are you on well water?
Most drinking water contains minerals, on well water could maybe have higher levels of magnesium content in the water.
To help lower his daily magesium intake you could switch to using distilled which has all minerals removed or "purified" bottled water which will have most of the minerals removed http://www.goaskalice.columbia.edu/2007.html
on it's own won't make a lot of difference, but when combined with diet may make enough of a difference so as to feed something better than the Science Diet and still achieve a low enough daily magnesium level
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