1. Give benefits to the guild for upgrading towers and keeps (Influence reward every 10 – 30 min, Or either silver, finding a good balance that well defending will pay out the upgrade costs).
2. Difference in sever population.. lack of chance on low populated sever (Never have an overflow) Yeah it does work like a spiral → people feel they don’t have a chance → people go PvE or either to a different server. (Yeah a different setup will be needed to create fair battles, either find a way that the opossing force is not able to outnumber.. outnumber and once again outnumber you. (Make it you can only bring 5-10% more folks then the lowest number in the current battle, instead of 50-100% more enemy’s).
At that time no merge will be required, it will be solved all by the players them self.
3. As seen several times above.. squad UI or either small group UI → communication option between commander/squad and party’s. (You might want to be able here to create bigger party’s like around 10 ppl). That the commander can actually request a 10 man group heading to defend a tower or capture another one.