Looking back at my test prints, I see there are some registration problems with the green block. In the left image, there is green that sticks up too far, onto the top of a rock that should be mostly white. And on the right, there are some areas of green that extend past the border.
To address this, I used some micro-lumber (HO scale 2×4, I believe) I had laying around from a previous life as an architecture student. I tacked it in lightly with water-soluble glue, in case it didn’t work out.
Wellll, this did not work out so well. I don’t have a picture, but in the test after that, it was clear that not only was this change in the kento not enough to fix the problems, it introduced problems elsewhere — a margin of unprinted area just beneath many of the lines that delineate green areas like the trees.
So, the registration needed to be fixed with a knife. This was more successful!