Wait until roughly 90% to slow. If you're pulling aggro every slow, then you just have a bad tank.
If it's a big issue, you can root before you slow. Most of the time, this is unnecesssary though.
On a similar note, if you initiate aggro with slow (pull with slow), it counts as less aggro than if you slow the mob after it's already engaged. In other words, the tank will be able to pull it off much easier. Again, rarely necessary, but worth noting.
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