There is no reliable way to accomplish what you are asking. The bucket allocation is done on a best effort basis, so even if we could swap the buckets, there is no guarantee they would stay that way over time.
The best approach here is to modify the WCCP mask to get a better distribution of load across the WAAS devices. You mention in your post that these two devices are part of your "core". Are there any clients located at the same site with these devices, or are all of the connections being initiated from outside this location?
This isn't necessarily a problem. WCCP uses a hash table of 256 buckets to distribute traffic across the devices in a service group. When you have two devices in the service group, each one gets 50% of the buckets (i.e. WAE1 gets buckets 0-127 and WAE2 gets buckets 128-255). When a device leaves the service group, the buckets it was allocated are reassigned to the remaining device in the service group. When a device is added to the service group, it will get 50% of the buckets, but it's not guaranteed that it will get the same 50% it previously had.
So in your case, when the 674 rejoined the service group, it's possible that it was allocated the buckets that the 612 was previously handling the 800 connections on. This is normal behavior and not anything to be alarmed about.
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