If you are converting from guilds your plunder will drop regardless of what buildings you put on new lands
I'm not converting. I have 2 vols, towers, new tower, 2 new spy's, and rest are guilds. I build everything on new lands
@Unicornis - you only have about 13-14 bil on allies. Verify that you are at mp. And building towers will cause plunder and AB to drop. SoS Lvl2 has been known to do that as well. However if you put up a lvl1 T6 attack building or spy building, your plunder may go down but your Allies Bonus will go up.
It's what I've heard. I put up spy buildings and it increased. A few people I know that are GHs put down a t6 attack building and replaced their old attack building with a guild and their immediate attack plunder dropped.