obligatory "swarming isn't aoe kiting"
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Are you still doing wisps and its not working the same or have you moved on to other mobs? Run speeds vary, like if you switched to beetle type mobs you'd have to drastically change your methods.
Trust if there was a change and aoe kiting came to a halt there would be about 50 threads per second created by mad zone disrupting suxbards demanding a fix.