@jcarcopo I’ve been following your findings with interest, not because of our ’bet’, but as a fellow enthusiast and since I am personally interested in the Encores / Ulfberths as a possible next step.
First, I’m not surprised with your impressions of the Benchmark amp in your system, as relayed via the Encores. For me, this isn’t a pairing I’d recommend for the SEs and by default, your Encores.
Second, a friendly caution that some of what you may be reporting on and experiencing is break-in related. For example, the HPA4 was a keeper but is now going back (as reported within a 48 hour period). I’m sure you are making the right decision for you, but I’m also confident in saying that you may also be experiencing some anomalies tied to break in of the speakers.
If you haven’t already done so, reaching out to owners of the SEs and Ulfberths privately to get their suggestions on ideal pairings may be helpful and a fun exercise.
For example, even though I haven’t heard the latest LTA pairing I have a strong gut feeling that @lancelock ’s pre and amp combo is a Fantastic one that may give you what you are looking for, despite the difference in watts (vs the NORDs). If I remember correctly, LTA offers return privileges.
As you consider your options, I strongly suggest a High Current amplifier and a well reviewed power supply /conditioner.
For example, the SR PowerCell 12 SE with the Galileo PC elevated my Pass XP-20 - XA-30.8 combo to a level where I likely would not have looked for another amp combo (had the PowerCell been in system first).
Shoot me a PM if you want to discuss more in person over the phone.