Finally I had a chance to try out the angle of the kammback. It's at about 15 degrees in the picture. There was no flow separation at that angle. tufts were flat and pretty motionless. I tried it at more like 22 degrees and the tufts didn't seem to lift, but they wiggled side to side a bit. Hard to tell for sure without seeing from the side.
I think I will leave it at 15 degrees which looks better, is guaranteed attached flow and leaves me some rear view. I may redo the videos tomorrow.
Here is the video at 22 degrees for what it's worth:
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