What if any, Raspberrypi players are people using with Minimserver

[mminga]

IMHO, it is a perfect player you could do it better than the most other, because you can adjust your player with your needs.
You can adapt minimserver to your needs.

I use it on in two RPI and on one tinkerboard systems:
Player is gmrender-resurrect:
https://github.com/hzeller/gmrender-resu...INSTALL.md
You can adapt the player to your needs, e.g. replay gain:
https://github.com/hzeller/gmrender-resurrect/issues/37
https://github.com/hzeller/gmrender-resu...issues/268

You can use very good DAC for small money compared to other solutions.

Convolution is also possible, either by MinimStreamer or in your player (I did it not yet):
https://github.com/hzeller/gmrender-resu...issues/275

The only thing, you need time and be familiar with Linux and technic.