I played with your images and also got a so-so result.
You are not very far out though! I hope you marked or memorised where you were at? As a couple of millimetres and you will be spot on! Dave's example shows you are getting close and with some more testing you will be on the money in no time.
I have seen work by "so called" experts that are worse then where you are at already! So don't despair - you almost have it.
The Kaidan website also posts on nodal points http://www.kaidan.com/nodalpoint.html
Also instructions should have come with your CS Panohead from Kaidan.