Thanks for your tip: I'll mix a new version for you with accordion and harmonica more in front and post it as a new post.
I mix these at my home studio monitoring with headphones and usually checking with SoundID Reference, that it sounds decent also in car, laptops and even in phones, but maybe this time I wasn't careful enough. I learned, that mixing listening just with high quality headphones or loudspeakers, you must still remember, that very often people are listening in pour environment and you loose all nuances in sound picture and tone quality you built with great hardship and toil.