That sounds more like fermented fish paste with aged vinegar. Something like Hakarl.

Nose feel should be a thing. I think it would useful for describing acidic flavors which seem to reach into my nose with some bite, at times, beyond just tongue tartness. Tsun is similar to Mandarin "ts-ong" which is used to describe the same feeling. Maybe I can appropriate the word into English like umami (which is a personal pet peeve of mine - I find it to be a lazy descriptor and overused buzzword in English).