we should definitely introduce variance.

[Jib]

+/- 8 hours on 3 day spawns
+/- 2 days on 7 day spawns

this will give a huge boost to population for a few reasons

-people will have to constantly track zones if they are dedicated enough to get the raid mob
-mobs will always spawn at a different time of day giving multiple guilds chances at raid mobs
-gives the chance for weaker guilds a better shot of getting a mob

When 1 guild takes all the raid mobs, it kills the server. we have seen this time and time again.

I vote variance and pvp!