Preamp Advice Needed - Gryphon Amp - Currently ARC Ref5se

Hello
I am currently running an ARC Ref5se (which i had enjoyed with various ARC Ref amps).

I now have a Gryphon Antileon Signature amp.
In comparison find the set-up a little dark or rolled off in the highs.
I tried a PASS X2.5 in place of the Ref5se and the top end opened up.

Does anyone know of other pres which might match or surpass Ref5se qualities but help the Gryphon top end open up a little? SS or Tube.

Any thoughts would be very much appreciated.