Several issues have been brought up that that I think can have a complimentary solution:
1) Lack of differentiation between ships within class.
2) The damage system range is very narrow in scale from top to bottom and limits variation.
3) They've completely ignored carronades and bow/stern chasers.

If they introduced ships and rules for carronades and bow/stern chasers, they open up so many possibilities for variation and differentiation between ships that would increase potential interest in further sales.