Although not classic that is a good idea. I would leave the variance in though. Why? Simply because once a target is killed at a certain time, you're almost guaranteed to get this taget locked for the people in that time zone and basically screw everyone who isn't. I.e. if a European guild kills VS, that means f... off for everyone who doesn't play on euro time (aussies, US, etc) and likewise the other way round.
Edited for clarification: The boss should all pop at the same time, said timer having a variance attached to it. For example, if the timer is 72h +/- 6h, the bosses would pop between 66h and 78h but all at the same time.
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