Sibilance on male or female vocals (or both)? What does your Roon eq look like now?Again after a couple of hours listening again tonight the boomy bass is much improved
The biggest issue to me is still the brightness in parts and the sibilance on vocals
You might want to try a high shelf filter (usually Filter 5 in Roon is pre-configured as high shelf). You can drag down to adjust the gain and left and right to adjust the frequency where you're dropping the treble. Male sibilance starts at 3k and female around 6k. Dropping 1.5 to 3 db at 4.5k might be a good starting point for listening tests.