I got the wheel straight. Perhaps it was not seated properly in the dropouts? (Although you'd think it would have fallen into place when I test rode it). In any case, after re-installing the wheel, screwing with the spacers (you'd think that the should be identical on both sides, but who knows) and the spring tension, I got the brakes mostly aligned. Still not quite perfect, but they work just fine (brake centering on canti's and v-brakes has always been a bit of voodoo to me, sidepulls are so much easier).