Matte finish seems sensible. Glossy would surely lower the readability of the legends. I'm still hoping for DSA though.
I'm a little worried about the red legends. They're weaker than the rest in terms of contrast and readability, yet they also seem to 'vibrate' a little, as red/blue combinations often do.
If you make the red darker, they'll be even less readable. If you lighten it while retaining saturation, they'll vibrate even more. If you lighten it while decreasing saturation, it'll no longer look red, but pink. I wonder if you'll end up having to decrease the saturation and brightness of the base blue a little.
By the way, the =/+ legend seems weighted a little too low perhaps.