I wanted to follow-up and thank all for the discussion and suggestions. It turns out that although the pads were adjusted with slight tow-in becuase of the large amount of play at the pivots when the brakes were applied they were rotated toward the rim, which resulted in the pads actually becoming "heel-in". I adjusted the pads with a 2 mm spacer to get more exagerated toe-in, and it cured the shudder. This proves to me that while a long fork tube/head tube may contribute to the canti shudder, it requires other issues to initiate it. Obviously, closer tolerances between canti pivot and post would help, such as on brakes that come with a sleeve on which the cantis pivot, a la Paul's.
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