I'd like to put an idea out there. I think it'd be interesting if you had more than one cannon on the same ship. So like
Cannon 1 attacks A+B
Cannon 2 attacks B+C
Cannon 3 attacks C+D
Cannon 4 attacks D+E
Cannon 5 attacks E+F
Cannon 6 attacks F+A
You could also do similar things with more ships ...
