Put the variance on the simulated patch. Every 20-30 days or so a patch simulation happens, and a serverwide message goes out (since back in classic you'd obviously know when there was a patch). The simulated patch days could be long like that, since stuff would generally be all spawning again at the same time anyways if variance was removed.
This discourages poopsocking, encourages quick mobilization, and encourages raid mobs being split across multiple raid guilds.
Sounds like the best solution to me.
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