As you may or may not know, skywars games contain a lot of campers that will stay on their island and keep bowspamming people untill they will eventually die because of the damage or because they get sniped off by one of these incredibly annoying players. I think that if the middle island contains slightly better loot than the chests on the spawn islands people will definetely want to go to mid. So than you hopefully wont have as much campers as before. One thing that may also help is bringing mid closer to the spawn islands or making islands in between the spawn and middle island, like in the map glass and sport. Just some suggestion to maybe get less campers. let me know what you think :)