Smoother integrated for JMLabs Chorus 706?

I have JMLabs Chorus 706 (89db) speakers powered by an Arcam 65plus int. amp (40wpc). The sound is detailed, punchy and smooth up until the highest freqs. I dont know if its the arcam running out of power or its just the titanium tweeter rearing its head. Im thinking about switching amps to smoother amp like the Audio Analogue Puccini (40wpc) or switching to a SS amp and tube pre. Any suggestions? I really like the Chorus's detail and speed,and the way they handle drums, but that last bite sometimes detracts from the music. I listen to a lot of rock, electronica, R&B, and hip hop.