While I haven't had the best of luck with the PVP but I do see its potential to be fun but I have some ideas that I think rare should include.
The first is, sometimes matches can take way too long to do, sometimes even hours if both ships are stocked. The idea is that maybe they should add a timer like the circle shrinks over time after a certain time has passed for example. Eventually that way the fight will end one way or the other.
The other is for those that spend an hour or so getting stocked up on supplies and then enter PVP only to lose quite quick and lose everything. Maybe they could somehow add a way that if the supplies are in barrels, we can keep them on our new ship in the new server so that way players can jump right back into another fight without having to spend so much time having to restock.
Those are just a couple ideas I had, I'm sure there have been many other suggestions but I feel those 2 would work out well.