The EM-emission values of different resolution sensors actually have an implication that I think is worthwhile pointing out:
- The Supersearch has gigantic EM emissions. If that thing is switched on, you are giving away you position to anyone within a huge range. Much further than you can see with the sensor itself.
- The Defendor has only very small emissions. These are unlikely to give away your presence to anyone who does not stand right next to you. It would be worthwhile keeping it switched on, to avoid surprise ambushes or even minefields
- You can only turn on all senors on a ship or none. Therefore it can be sensible to put the Defendor on a separate ship that the Supersearch. This allows to keep the Defendor running, while the supersearch is only activated when needed
I believe the spotting versus missiles is capped at missile size 6. I.e. you can always spot a size 2 missile at the same distance as a size 6 missile. Put differently, everything smaller than a size 6 missile is treated as a size 6 missile for target cross section. You might want to change the last plot to that effect.
You could also put a marker on the most relevant points in mass. For instance at missile 6, 250t (typical fighter), 1,000t (typical FAC), 5,000t (somewhat typical normal ship), 10,000t (somewhat typical capital ship).