webMethods 8 LDAP configuration with IBM Tivoli Directory

We are running IBM Tivoli Directory Server 6.2 and have about 5000 faculty staff principals and there are 100s of groups/roles contained for these. In addition to the faculty and staff, we have about 80K principals who are students.

I have modified our query filters and made adjustments, but I wonder why the queries under MWS 8.0.1 seem to hang up our LDAP server and force us to restart it.

The other question I have is are there any users out there using this config with IBM and MWS for the webMethods LDAP connections?