A regular trick of some accordion tuners was to tune the treble a little higher. But the real trick was to tune each higher note a little more high (more spread in the higher octaves) - so that each octave was definitely a little higher. I can't remember if any such trick was done on the Bass. You thus gut a 'beat' with the harmonics of different octaves, rather than having the octave of one note in exact tune (zero beat) to the next.

But if you tune the whole instrument a tiny amount higher, it will sound 'brighter', and tend to stand out if playing in an ensemble. Piano accordions were often tuned to A=442 for instance.