8 ohm speaker that sounds like sonus faber

The PE's IMHO are a fairly tough load. I think they are a great speaker, but surely not an 8ohm load. An amp that drove them well for me was an Air Tight ATM-2 at 75-80 watts.
Of course the ATM-2 w/ Tamura Transformers are not your average 80 watt tube amp. The Fidelio Encore, while not as full range, is an easier load that will work w/ 60-70 watts.
Not saying the Parsifal cannot, but it will be more of an individual opinion, w/ things like room size and type of music perhaps coming in to play. Again, all this IMHO.

Hi Marty. Yes, us common folk must participate in those damn trade offs. My room at the time was 24 X 14 w/ 8 ft. ceilings. Interesting it was an OTL amp that didn't work for you. It was my Tenor 75WI that didn't quite do it for me. A real shame, as both the Tenor and the PE's are both so good, just not paired together. Your point that the FE's would not have the bottom octave is a good one. That is why I bought the Parsifal's, after having heard the Fidelio's. At that time, I believe the Fidelio I heard was not the Encore though. Bottom line is I also believe the OP should be fine w/ 70 healthy watts. I would like to make one last point. I will say the Parsifal's may benefit from the extra power. My brief audition w/ that ATM-2 was a rewarding experience. Ultimately, I chose to keep my 250 watt CJ 8A's. The other map I had w/ the PE's was an Accuphase A50v. That amp really grabbed hold of those 4 Ohm woofers. I still sold the Accuphase to stick w/ tubes, but it's capabilities were obvious. Tight, detailed bass control.