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I finally solved the linearity problem! After replacing all the electrolytics in the circuit i still had a bar about 1/4 way down the screen where the lines were all scrunched together. There was only one capacitor left, a .068 in what looked to be an electrolytic aluminum housing that was marked .047 (I figure there will be a few value differences between the Sams and the one they sold in Europe). As I moved it aside to get a look at it, the bottom lead popped right off, it was corroded all the way through. A new .047 later I've got perfect linearity.
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