mel_scale_norm image distortion issue

[AbyszOne]

It has been commented that the transformation to image lacks low frequencies.
This is completely true, and a really tedious flaw.
However, the problem is quite clear. mel_scale_norm off removes bass and keep treble (Default). ON, less treble and keep bass. There is no middle ground.
And that is the question. Isn't there a way for the spectrogram to just keep both halves of the image at the same dynamic range? I mean, such a distortion has no useful reason to exist in the first place.