Goldfish: 12322 matches (22.5%), 5975 wins (48.5% win rate)
Junker: 7969 matches (14.5%), 3819 wins (47.9%)
Squid: 4892 matches (8.9%), 2496 wins (51.0%)
Galleon: 5135 matches (9.4%), 2412 wins (47.0%)
Spire: 6216 matches (11.3%), 3634 wins (58.5%)
Pyramidion: 14510 matches (26.5%), 7057 wins (48.6%)
Mobula: 3765 matches (6.9%), 2014 wins (53.5%)
Taking a look at this part, since I'm a big numbers nerd.
I would argue that usage rate is fine. Muse tells us that Goldfish and Pyramidion are "overused"; Squid, Spire, Galleon, and Mobula are "underused". But if we think about it, aren't Goldfish and Pyramidion supposed to be well-rounded, relatively easy, and commonly used ships? Aren't Squid, Spire, Galleon, and Mobula supposed to be specific-talent, harder, and less common ships? We really shouldn't balance ships based on usage. That would be like buffing Medics in TF2 because you almost never see more than 1 per team.
Looking at Win Rates. Squid and Mobula's win rates looks about right because it is almost always veteran, competent players that take those ships. Pyra win rate is where it should be, since inexperienced players usually take this ship. Same goes for the Junker and the Goldfish.
However, Muse should take a look at the Spire. That win-rate is statistically significant. I ran the stats with the null hypothesis that the real proportion of Spire win rate is .5. alternative hypothesis that the real proportion is greater than .5, used the proportion p1 = 3634/6216 = .585, and p2 = 3108/6216 = .5. The resulting pvalue was 1.436*10^
-21. Since pvalue < alpha, I reject the null hypothesis. There is sufficient evidence that the real proportion of Spire win rate is greater than .5.
For non-statisticians (and great-statisticians that got confused by my novice write up), this means that Spire is almost definitely having more wins than it should. I think the hull health buff it received last patch needs to be toned down a bit.
So, these are the things I can see from the numbers. Spire needs a fix. Other ships are fine where they are (for the moment). Muse should not base balance on ship usage. Balance and ship usage are unrelated things. Squid isn't being flown frequently and that's how it should be.
Muse, try to base your balance on player feedback, controlled tests, and mathematics (which the forum does for you once in a while).
And Muse, although you guys sometimes do things I don't like, I still appreciate the hard work, and I love Guns of Icarus Online.