Dac differences tend to be small relative to other changes and can be harder to distinguish in quick listening. Either give it more time to see if differences emerge or be happy with the sound of your P6 and move the Aries elsewhere.
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Some tricks for Ares II:
1. Keep it on 24/7 for best sound
2. Use only the RCA or XLR output, but not both at the same time - the output are shared, connecting both output may degrade the SQ depending on the input stage design of the connected devices.
3. Configuration Guide for NOS/OS: https://www.denafrips.com/single-post/2020/03/12/ARES-II-DAC---Configuration