The biggest take-away is you have a nice instrument to play on, I think. Real talk, I’m not a super huge fan of classing shamisen by their genre (despite doing so previously).
Like technical definitions aside, the music you play and how you play it are the most important markers in my opinion.
Point of fact, one of Toyama’s most famous min’yo pieces (Etchuuowarabushi) is typically played on what basically amounts to a chuuzao nagauta (they clock in at about 2.6 cm wide, so right on the borderline). They generally sport rather thin itomaki, have a curved hatomune, and generally do not have azuma sawari.
So do your best to enjoy, and don’t worry about the details too much~ !