Smaller ships are faster and it's supposed to be a game of catch rather than rock 'em sock 'em robots. The bigger ship needs to furl sails in order to score good hits, giving the smaller ship a chance to run for it at full sails. Otherwise they end up inefectually missing each other at full sails until one reaches local waters, unless extreme variance (boxcars happen) occurs.
For the record, a skeleton crewed Leopard (only 3 PCs on board = 75 crew sail max) narrowly escaped an encounter where it was chased by a fully crewed 100 sail Ark yesterday. I've seen Ironhelm just trounce 100 sail pirate brigs in a fraction of the time.
Just for comparison here:
- The arcane cannon yields the equivalent of a bombard shot
- The frost cannon is more akin to a light javelin
Sure, both are extra and any ship suffering a direct hit from either gets considerably slowed down, the arcane cannon just deals 8x more damage...