I've mentioned this quite a few times before as well, but here goes.
A lot of times when we're seeing excessive traffic or multiple activations, we'll turn off addy book, calendar, tasks, email filters and the like (the ones that are still initializing for so long). We turn them off, activate the device and it completely within 3-5 mins or less. Then we'll turn them back on and let them update at a slower pace. While this is a little more work for the admin team and you must explain to users it might take up to 12-24 hrs for all the info to get populated to their device, it has worked pretty much flawlessly for those devices that get stubborn around the 85-90% range.
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