Nice job on this. That's some serious programming for sure.

Reverb actually sounds fine to me, if anything I would say it'd be better to have the beginning come in quieter and build up the volume. The timpani at the beginning might sound better played a little softer at the beginning. Generally I do like a nice big hall sound but I find these days I use less reverb than I used to and instead just take more control with the volumes, velocities etc of my instruments. And I work up a nice fat sound by using Steve slates plugs that give a nice analogue sound.

You might want to increase the release time on you instruments a little just to give them that extra bleed time. And certainly using a little of the VIs built in reverb (around 25-30) can give just that right feeling of space without setting the instrument back to far.

Just think of where your instruments sit in your virtual room. If your timpani is sounding close and full, then it won't sound like its at the rear of the room .. Where it should be 😜 same goes for all instruments.

Damn nice piece.