I too have a pair of the 545’s, in my case the Ultimates, in a small room. In regards to imaging, placement is everything. You need to experiment until you find what’s best for your room. Acoustic room treatments should also be considered.
In the case of the Pass Lab XA.60.8 amps, in my country system, with the U-1PX, they do a very satisfactory job. The 60.8’s definitely did not have enough power in my city system with the 545’s, but the X-260.8’s drive them very well.
Nearly twenty years ago I was a Wolcott dealer and loved how they drove Sound Labs. But when Henry Wolcott aged out, it became almost impossible to get them repaired. He held the schematics tightly, and very few techs knew how to trouble shoot them. I also owned JC-1’s, but found them to be too neutral for my taste.