Good point, they could probably do with a fair bit of desaturating. Honestly, I was just trying to make them pretty, I didn't even consider the point you brought up. Plus, I'm not overly creative so I was focusing mostly on making sure the colors I used were different from eachother. Will definitely put them in the map as a preview and desaturate a bit, thanks for the suggestion!
Here they are on the map, desaturated by -25%. They won't be nearly as big in the final product, but this is what the colors would look like in their adjusted form.