The errors may not be down to your settings on the NN3 at all. I dont use hugin, so not sure if there is a function like sensor shift as is with PtGui. I was having a hell of a time trying to find this magic spot of no paralax and was always getting errors all over the place. Saw on a thread (on another forum) a comment about optomising for sensor shift. Was like a light being switched on and stitching became so much easier. Try that (if possible).