Help with possible integrated amp change for better match with my speakers.

Hello,

I've been using a Simaudio Moon 600i V1 to power my Focal L&R Utopia B speakers for some years now. 

I have spent lots of time with power cord, and interconnect cable changes. Also different outlets (Furutech GTX-D, both NCF(R) and Gold) I've plugged the speaker ports for a less bloated sound and have the system sounding actually quite nice. BUT...... all the same I'm missing some of the fine micro details buried in the music.  

This brings me to my question to you. I've been thinking about trying eather the Luxman L-509X or the L-595ASE integrated amps. Do you think this would give me better detail retrevial than my current 600i amp does? Would the 595ASE class A amp do a better job with my speakers than the 509X?

Or is there a better choice of integrated amp than this I should consider to achieve my goal for better resolution of fine micro details? 

Thanks for your time and thoughts.