Update: Sadly, I had to scoop up a dead white-winged dove yesterday afternoon. It apparently broke its neck after slamming into the windowpane. The only good news is it probably died quite quickly, but this is going to tear me up if its as bad a bird strike season as last year (I had three died -- two immediately, and one that sat on our backyard deck for hours and, when I went out to check on it before sundown, barely cleared our back fence... I suspect it didn't live much longer.)
If anyone has suggestions I haven't explored yet, let me know. The eaves above these windows are too high to make hanging CDs or other dangly things practical -- I can't reach the roofline even with our ladder, and the ground slopes away. What with my knee and all, I guess I'm a little hyper-sensitive to climbing up 16+ feet.
I can, carefully, reach the middle and top 1/3 of the windows if I have a spotter, so I may have to go back to taping up shiny things on the actual window pane. It didn't thoroughly stop the bird strikes, but it significantly reduced them.