I'm surprised your having isssues with the sound of the PWT/PWD combo. I've been pleased before it broke in and since breaking in found it to surpass my older, but very respectable, Levinson Reference 30.6 DAC and 31.5 transport. Right away, the PWT/PWD just seemed to get the music right. I've since upgraded the HDMI cable to PS Audio's top of the line silver HDMI on several people's recommendations. It put the combo even further over the top.
As for volume, I'm currently setting the DAC at 75 to 80 on the volume display and then sending the signal into the ARC Ref 3 preamp. I broke my HDMI cable by playing just the transport into the DAC over Xmas break, for about 2 weeks the Purist Audio break in disc along with others. It sounded better each time I listened, and I assumed the new HDMI cable was broke in then. However, since being home, and having it play in the system, instead of just between the DAC and tranport, I've been amazed at how much it seems to improve each night. I really can't explain why this has happened. But this is what I'm experiencing.
I hope your PWT/PWD starts reaching its potential. But as we all have found out before, a component that sounds great in one system, may not make the grade in another system for many reasons.
Good listening,
Steve