LDAP Group Cache

we are using openfire authenticating against Active Director. I have visited this site

http://wiki.igniterealtime.org/display/WILDFIRE/HowtoconfigureWildfire%27scaches

and have tried playing around with my cache settings and ran into some trouble. I have been able to tweak the user cache so that my users are populated quickly when changes are made. But my group membership stays cached until I go to cache summary and clear cache for the cache name of Group.

Currently group says its size is 1M and I have tried to change that using these settings:

Group cache.group.size cache.group.expirationTime

Group Users cache.userGroup.size cache.userGroup.expirationTime

and none of them have worked. But once I clear the cache for Group my group users are correct. so how can I decrease either the life or size of the group cache?