Hi Edwardr,
Please try below and let me know how it goes
For Speedup your query
A) Try to use your query as
Targeting dimension is Deliveries and
Filtering dimension Recipient delivery logs
Extra check for scenario like this :
B) Add check for status of delivery : You don't want to track for those who never received delivery .
C) Add a check to avoid Proof/Seed Emails
Thanks,
Kapil