The Diventix-8022 does not have the issue of vertical lines in the blend zone. Ken Whitcomb was able to confirm (last Tuesday evening, during final calibration) my engineering hunch that 1) perfectly matched blend zone geometry, and 2) perfectly matched gray scale calibration, results in no blend zone in any scene.
The "piece de resistance" was the use of color correction boards in both projectors. These allow 18 zones per projector (3 rows by 6 zones per row) of both intensity and color (RGB drive and G2 per zone) adjustment. Ken matched the color in the 3 right most zones of the left projector to the 3 left most zones of the right projector. No color distortion in the blend zone.
Finally, Ken also used the 3 left most zones in the left projector to remove a "red push" in the left side of the left projector. Result, video nirvana.
This weekend, I am going to perform a 32 zone Audyssey Pro audio calibration to create room equalization filters for the Denon AVP-A1HDCI audio processor, to bring the audio side up to the standards of the video side. The Denon can decode a 9.3 setup, which I have Going clockwise, starting from the front left channel, I have set up: Front Left, Front Left Sub, Front Center, Front Right Sub, Front Right, Right Side Front, Right Side Rear, Right Rear, Rear LFE Sub, Left Rear, Left Side Rear, Left Side Front.
By Sunday, I will be loving life.