@audphile1, very strange. I like the HF with the Shunyata. Since we both use Pass amps and the Sabrina X speakers, I would have thought you would have a better experience. I wonder if room acoustics have anything to do with your experience.
I love my ARC REF 6 in my system, and have no interest in changing it, at least at this time. It has great synergy, and I like it even better than going direct from my MSB DAC to the Pass amp, which is no slouch either. I do not really like the hassle of tubes (when they become one, that is) and of course, I am keeping an eye on what is going on at ARC right now. However, I will not be getting rid of the ARC until it dies a sad death and at that point, I will be looking for a "tubey-sounding" SS pre.