As far I know there are 2 retention perionds for deleteing XML messages and for deleting history.
I have changed this parameter for history (PERSIST_DURATION HISTORY = 10)
How retention period of history correlates with retention periond of XML messages?
How to change retention period for XML messages?
Deleting job of XML messages has deleted all messages with 30 days period but PERSIST_DURATION ASYNCH has 1 as default value.