Here’s a link to a thread here about the Terminator Plus and the T+A 200. Not exactly the same Terminator but close.
https://forum.audiogon.com/discussions/denafrips-terminator-plus-vs-t-a-dac-200
i run a Pontus II with a Hermes via the I2S connection. After adding the Hermes the difference is notable in all aspects, much improved soundstage, imaging, transients, clarity while remaining musical. It might be worth it to just add the Hermes to your Pontus and see if that gets you where you want to be.