That's a tough one to analyze -- just counting stations is a challenge. Here's my take on it:
Name Countries-Borders-Neighbors Bonus
- Code: Select all
Metro 4-3-6 5
Central 9-7-8 9
Jubilee 6-5-8 7-8
Ham&C 4-3-5 4-5
North 12-9-8 12
Distrct 7-5-4 6
Picadly 9-7-6 8-9
Bakerl 7-6-8 8-9
Victor 7-6-8 8-9
Circle 8-8-8 10
Assuming my counts are correct (although I probably got at least a couple wrong), I'm surprised that your bonus for Bakerloo is that much smaller than the one for Picadilly: it may have slightly fewer countries and borders, but it's more central: it can be attacked from almost any other line on the map. I'm also very surprised that it's smaller than Victoria at all, since as far as I can tell, they appear to be more or less identical. I suggest increasing Bakerloo to 8.
I'd also suggest increasing Metropolitan and Hammersmith & City to 5: this is going to be a very difficult map to hold continents any on, so I think even the smallest ones deserve a fairly hefty bonus. If you wanted to take armies away from any continent, I'd pick District as the one to reduce by 1 (largely since it's as close to being "on the edge of the map" as anything here), but it's probably OK as it is, since it's reasonably similar to Jubilee.
This map is coming along quite nicely. I like the logo, and I think the info box in the upper right is both very useful and quite appropriate to the style of the map. I am currently counting seventy-three countries rather than seventy-two, but that's probably my mistake, just because those little circles are difficult to count: feel free to correct my numbers above. Speaking of circles, have you tested them with lack's mapmaker script, to see how the army counts will look on them?