An important variable to consider is the frequency response of the amps at various loads. Speakers' impedance varies with the frequency, often with large peaks and valleys. Since the frequency response of most amps changes with the speaker impedance (load), it is not at all surprising that a successful amp/speakers combination is usually the result of careful matching.
It is not unsual for an amp to sound too bright on some speakers and muted on others, bass shy on some and bass heavy on others. You cannot necessarily fault the amp or the speakers or make blanket statements on their capabilities. Not all great amps perform well on all great speakers and vice versa. For example, I have had great results with my Watts/puppies by using the Rowland Model 7, and BAT Vk-60. The Krells sounded unbearably bright and, overall, less refine with these speakers. Yet they perform well with your speakers.
So, in addition to other considerations, take a careful look at the impedance of your speakers from 20Hz to 20kHz and try to find amplifers that, among other things, compensate well for your speakers' characteristics.
It is not unsual for an amp to sound too bright on some speakers and muted on others, bass shy on some and bass heavy on others. You cannot necessarily fault the amp or the speakers or make blanket statements on their capabilities. Not all great amps perform well on all great speakers and vice versa. For example, I have had great results with my Watts/puppies by using the Rowland Model 7, and BAT Vk-60. The Krells sounded unbearably bright and, overall, less refine with these speakers. Yet they perform well with your speakers.
So, in addition to other considerations, take a careful look at the impedance of your speakers from 20Hz to 20kHz and try to find amplifers that, among other things, compensate well for your speakers' characteristics.