War loot is prorated based on participation. So everyone's war chest fills at the same time but someone who participated less will get less. Most alliances that are even semi active will kick members who drop war flags. Most alliances are fine though if you opt out before matchmaking starts.
Titans, try to do at least 1% of total titan health for C class loot. Less than that and your loot drops substantially. Even better is B class loot at 3.3% (multiply total titan health x 0.033)