I think this would fix everyone's PBT issues
If you add time back to the PBT for successful raids, I think a lot of the balance issues after the th11 update would fix themselves. Tie the time that goes back to the PBT to the league bonuses.
You get no additional time for trophy dropping.
You get 1.5 minutes added for a 50% attack.
You get 1.5 minutes added for destroying the town hall.
You get 2.5 minutes added for total destruction.
Subject to some arbitrary cap (say 6 hours), at which point none of the bonus time will count and the player will be forced to break.