They needed 3 months to break the "ornament for less grind" interaction. I'm not going to scour my ornament list and blow transmog synths (why is this even still a thing??) just to find which 3 IB armors trigger the reduced grind. So far, only my emblem and heavy weapon seem to be counting and I have armor ornaments from 3 different IB seasons equipped. Still only 2 out of 5 in reduction credit.