Makes sense, thanks. Doing some more experimenting here. I'm thinking about playing around with my Google Map Tile Zoom Level to see if that has any effect...
Below, the first image is a building in the PNG file created by the Transdem map tile client. I used Google Maps, Orthophoto, Zoom Level 21.
The second image is the same building in the TGA file created by the Transdem UTM tile exporter (3D tile, 500m, 4096 pixels). I notice there are fewer pixels per meter in this image, so maybe Zoom Level 21 is overkill. I'm trying to get as much detail as possible in imagery adjacent to the track.