Note that there are two places where max_matches limit is enforced. Per-query limit is controlled by this API call, but there also is per-server limit controlled by max_matches setting in the config file.
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Thus, it is not enough for the request to specify in the config, you must specify max_matches as the third parameter when calling the SetLimits through API.
For example in your case would be $cl->SetLimits(0,3000,100000);
