As far as timers, more random wont help US guilds at all. Euro raids until 5EST? You Raid until 12 EST. That leaves 7 hours when mobs can spawn for CW and 17 hours when they can spawn for Exo. The only system which would help give US guilds a fair chance vs europians is if spawn timers were an exact day amount + 0 - 6 hours. There are some mobs like this in game, but not many. This means that when a mob dies during euro time, it has a good chance at spawning during US time for the next kill. Europe would still have an advantage, since all mobs killed during US time would be up for the beginning of their raids, but at least US guilds wouldn't be stuck endlessly having to stay up/wake up at absurd hours in order to progress.