Sorry about your Naim. What power amplifier are you using between the Node 132 and the Harbeths? Part of the Naim?
The new Node Icon is reported to have a considerably better DAC. I have not yet heard it, but perhaps you can exchange your 132 for that and give it a try.
I also have a pair of P3ESR, and I run them with a powerful (300 wpc) SS amp. That amount of juice probably isn't necessary, but I like the results.