Maybe there could be black or white outlines around:
1. The tent location icon's medical sign. In some servers, Red team may have a hard time trying to find their own tent on their map if there are similar colored clusters around it, since it blends in to make it appear as just a red square.
Or you could place both an outline on the cross and the main icon, making each color the same to each other for any team.
2. Command posts/intel.
3. The text. I literally have to strain your eyes to see what someone typed if I am facing or surrounded by brigtly colored voxels. Basically all the text in general should be outlined by at least one pixel. (Reload sign, killstreaks, anything text related.)