Bass/Lower notes in piano playback too low

Hi everybody!

In my scores (especially with piano), the playback reproduces the lower notes much less forte than the higher notes. I think this is due to the “Automatic polyphonic intruments voice balancing”.

Is because of this or because of another thing (I use Noteperformer as a midi, not the default in Dorico)?

If so, could you recommend me a setting of this “Automatic polyphonic instruments voice balancing”, for it to make more human but not devaluate the volume in the lower notes?

Thanks a lot!!

This is the original setting in Dorico: