Hello! I think that the loudness standard within the synthesizer will not be relevant. Because different voices have different volumes. And I don't mean density (!).
I also disagree with the volume balance of the inside styles and right-hand voices. Yamaha has another bad feature - it hides the voice under the reverb, although the T5's sounds are already capable of sounding WITHOUT decorations.
I always mix sounds in my own way. Of course, if this does not apply to live performance. I separate the tracks as much as possible during recording and mix the audio data. In this case, the result is stunning.