I think you'd enjoy the Wilson WP7 in your system.
With the ARC Ref2 and X350.5 I would not worry about hot treble with the Wilsons.
Dynaudio should be a good match as well.
I don't know what you meant by whisper treble on the 802Ds though. I think the X350.5 may be just about the starting point as far as power is concerned fot the 802D so if you don't listen to heavy metal at ear bleading levels, then it may do.
With the ARC Ref2 and X350.5 I would not worry about hot treble with the Wilsons.
Dynaudio should be a good match as well.
I don't know what you meant by whisper treble on the 802Ds though. I think the X350.5 may be just about the starting point as far as power is concerned fot the 802D so if you don't listen to heavy metal at ear bleading levels, then it may do.