I can barely see the light green shade now, but maybe just a monitor issue unique to me. Light red is OK.

Well, maybe "barely see" is a little dramatic. But it's light enough that scanning the right-hand-side of two-up diffs for new blocks of code feels harder than it used to be.

I changed new-full to be light instead of bright, maybe that's it?

(it felt too overpowering with a richer green)

I can bring light green up a hair