Aged or Staged dunning configuration?

Summary:

We want to include all overdue transactions in the dunning letters being sent. And also not send dunning letters each time "send dunning letters" is run.

Content (required):

Staged: (As per Doc ID 2499022.1), If a transaction in included in a prior letter, then it is not included in subsequent dunning letters runs. 

This is too confusing as customers do not track these letters. So we want to send all delinquent transactions irrespective of dunning letter format.

Aged: This includes all transactions in the dunning letter. 

But, with this setup, each time send dunning letters is run then letter is sent to customer each time. This is never acceptable.