Yes the PSA seems to compliment the Wadia/ Harbeth 30s very well with none of the 'dryness' I was originally concerned about.
One clarification to my previous post is that I didn't have the wonderful Wadia when I owned the the NCSE integrated. So comparing it directly to the Nagra was a litle unfair. The LFD is a lovely amp as you know.
The Naim/ Harbeth match up is a classic pairing, not surprised it sounds heavenly. Only problem now will be to avoid the temptation to keep moving up their line!