I know exactly how you feel.
Check the settings on you AD Server, as per this and this, and note the caveats and limitations on the latter page regarding max number of entries in a secondary user group, and the MAX size of MaxPageSize.
Short of it: Looks like you can set MaxPageSize in AD as well, but the MAX MaxPageSize / request is 1000...Looks like you're SOL (another microsoft link here that supports the claim).
Flex the Geek
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