for start would be nice to just change how VP´s are gain.it won´t prevent multiple wings working together but at least biggest kingdom on server wouldn´t get too much a lead just because they have most members in kingdom. by simply implementing reduction of VP production per number of players.
let say:
50 players / 100% VP´s gain per treasures
60 players /90% VP´s gain per treasures
70 players /80% VP´s gain per treasures
80 players /70% VP´s gain per treasures
90 players /60% VP´s gain per treasures
100+ players /50% VP´s gain per treasures
or
1-70 players /100% VP´s gain per treasures
70-90 players / 80% VP´s gain per treasures
90+ players / 60% VP´s gain per treasures
just example not sure how % should look like exactly in order to work it properly
big kingdom or even meta would still have advantage of numbers in terms of deff/off power , resource production etc. but at least they wouldn´t have insane VP lead so other smaller teams have bigger chance to fight and compete for first place. i believe it could make rounds more balanced.