The Brevetto may indeed be heavier than your Hohner, but compared to other 41/120’s, it is very light. I can tell you without a doubt that of my collection, the Scandalli is the 2nd lightest 41/120 and only 1 pound heavier than my Mundiger, which that accordion is a 3/4 (not a 4/4) and smaller by a good amount (lady sized keyboard vs the full sized keyboard and body). You will seriously be hard pressed to find anything lighter without spending 5-figures in US cash.
Looking at your registers, I get the feeling yours is a 3/4, a different combination from mine, and probably even lighter than mine if missing a reed block and associated hardware.
Want weight? Try a nice 33lb Hohner Morino VI N for 2 hours, let’s hope you are in shape… lol
All that said, if you are not happy with it, then you are not happy. Not all accordions are the perfect fit for you. I have a broad style of playing and therefore am blessed to have accordions specific to each style. If I want French musette, the Beltuna is my choice. If I want a steiriche feel, my Antico is the choice, if I want classical, my Hohner FB36, Morino VI N or Gola are the choices, if I want traditional Czech, the Scandalli will be my choice… but any accordion can play any style, if you want to.
