I don't soak unless I detect a "kiln-dusty" smell. I have the same kind of yunomi, coming from the same kiln I'd say (I think I recognize this cup from eBay
I stick with japanese sencha with it, but this is merely sentimental as it was my very first yunomi when I entered the sencha world. It will smooth a bit your teas, like a banko clay would. I like this kind of effect with japanese green teas and young puerh, but not very much with oolong. Personnal preferences.
Have fun with it, and keep the photos coming !