Join Date: Jul 2005
Location: Boulder County, CO
Bikes: '79 Gios, '80 Masi, '06 Felt, early '60s Frejus
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I'd start undoing the changes, one at a time, that you made before the bike started shimmying, starting with the most suspicious. That would be the single pannier, because its center of gravity is well off the line of lateral symmetry and behind the rear axle. After that I'd try going back to the Maxxis tires.
A road bike will be more sensitive to load imbalances because of its shorter wheelbase and altogether lighter weight.