Ok.
If you have a cd transport or an old dvd player try to compare streaming to CD and see if CD sounds better. I’m pretty sure you can fine tune the setup to get rid if that harshness. Unless you’re really moved past that and just focusing on getting a new DAC. I’m afraid that any revealing and detailed DAC will give you the same type of presentation and you will discover the issue is with network or cables.
Just as a data point can you list your network configuration (router, switches, cables) and power cord and interconnects you are using on DAC?

