I've had my NN for about 2 months now and love it. I'm also using the R-D8 lower rotator. But I'm still having some issues with stitching seamless panos together. I've tried a variety of tests to find the no parallax point and think I'm nearly there.
I'm shooting on a Sony a300 with a 18mm lens (27mm with crop factor). My upper rail setting is 100 and lower rail is 50. I'm shooting 10 images per level, with the levels at 0, 45, -45, and the nadir and apex. I use AutoPano for stitching and clean up the control points. I'm still getting slight errors no matter what settings I try. This is a new image: