Trying to track with Camera on circular track

The solve I'm getting makes it look like the camera is on a tripod panning from left to right. Though there is little movement, it's clear in the shot that the camera is moving on a circular track. I've manually added trackers, but still no improvement on track.

How do I "trick" Syntheyes into thinking the camera is on a circular track? I'm using SynthEyes 2008.

Thanks,