first you have to ask why the variance was put in to begin with, why its changed a little and where we are now. Rooted Dragons was a huge change, for better or worse is up for debate.
it started with who can camp fear or w/e target first and hold it till it pops, bad times. Small Variance helped out but soon it wasnt enough and then we had rotations untill velious came around. . .go figure.
Most options have been tested and Even with the variance we have its still somewhat easily controllable.
(those that pray for server resets ect.. to get the timers clumped)
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I'd suggest the ragefire-esque timer, say vox 7days classic timer, thats 4 times a month. I would love to see someone try to "lockdown" targets that could spawn 4 times anywhere from the 1st to the 30th potentially back to back even wiping raids. compound that to every target and there is no way you could keep tabs on every target 24/7 -365 to "Lockdown" a set of mobs but then again this is p99.