As you've obviously determined, no reason to think the ST9688 won't be fine for a ~5k mile oci.
As for Nissan OF efficiency, very doubtful any 'authoritative' information can be found. Just the way the OEM OF efficiency generally is, proprietary. If I was to 'speculate' could only compare to what is known about the couple/few Asian oem filters with some efficiency information posted on bitog. Still be just speculation though.