Hey K,
Sounds great as usual! Agreed that the tuning is very logical.
Yep, there are a few people using diminished chrom including Jason Rogers, JP, G and others. I play it all the time and used it on this track on a CD by Argentinian harpist Athy (the unison melody is another tuning): https://soundcloud.com/eugeneryanharmonica/cuchuflos-jig-excerpt-2
I don't have a lot of tracks recorded with it although I plan on doing some recording in December.