Both for realism and gameplay reasons small ships should generally be faster than big ones.
Also, in general 2 small sails should be faster than a medium sail and 1 medium sail + 1 small sail should be as fast as a big sail.
2 small sails = 2 weight
1 medium sail = 1.7 weight
the 2 small sails should logically be 8.5% faster than 1 medium sail.
Also handling and weight sails need a serious buff, nobody is fucking using them. The whole meta is big speed sails, which is both boring and ugly.