Thank you for your detailed feedback! Indeed I wanted to give some space between each chords to avoid any saturation, and trying different timing to make it sound natural eventually took me to the unplanned 7/4 signature and 9/4 at the looping point.
For the piano solo part by it's nature, it was most important to make it sound natural like an actual human playing instead of all notes sounding the same in terms of timing and velocity. So instead of fiddling with bunch of automations(as it would take a horrible amount of time and frustration) I just played it freely without click, and then did small tweaks. but then, with the orchestra It had to be quantized which I think made it sound more dynamic rather than expressive.
For the 3rd section, I decided to step back in dynamics trying to render the act of battling into a something more choreographic like a dance. Anecdotally, i was also thinking in an actual gameplay, having the music blasting full on for the whole battle would cumulate fatigue and end up irritating the player ˆˆ;