Sounds like you need a preamp too unless I’m missing something. Not a Mac fan here — I heard the Blade 2 with some top Mac electronics and it was rolled off in the highs, which is not characteristic of Blades at all. You might consider a good integrated from the likes of Vitus or Gryphon that are higher level IMHO and will help flesh out the bottom end while never sounding overly bright with your KEFs. Here are a couple good examples…
https://www.audiogon.com/listings/lisa55a5-gryphon-diablo-300-with-dac-option-solid-state
Best of luck.