Hi Nick,
You should be running additional commands, not just the 'reuse delay'. These are my command suggestions:
Update stgpool dir_cont_pool reusedelay=0
Update stgpooldirectory dir_cont_pool access=destroyed
Audit container stgpool=dir_cont_pool action=markdamaged
Audit container stgpool=dir_cont_pool action=removedamaged
Also, change the dir_cont_pool with your container storage pool name.
I hope this works our for you!