When an AA policy is administered using a per-AA subscriber policy attribute assignment (ASO override) as opposed to using a service profile-based model, the number of attributes and values of ASOs that are needed in an AA Group can be much larger than the ASO scale needed for app-profile based deployments.
In conjunction with the App-profile ASO override, set the AA-group to a mode optimized for the needed ASO, subscriber, and flow scale requirements.