I’m attempting to do this right now with a circular projection table and CCV 1.5. (1FFMV setup) The corners of the projected and camera images are not on the touch surface. I touch the calibration points I can correctly, and touch the same garbage point for all the ones I can. Then I go back and edit the garbage points, interpolating them with my best guess. See scatterplots below.
However, after trying this, my touch points are askew. On the left hand side of the circle, I’m registering about 4in left. Towards the right had side, it gets closer to perfect.