Bookshelf Speakers for Luxman 590axii?

Hi All - 

I’ve been running a Luxman 590axii in my office for a couple of years with Buchardt S400 MKii speakers. While the pairing is good I think the Luxman really need an easier speaker to drive. This is a secondary system and I’ll be switching in the Luxman and new speaker every few months for variety. It’s a smallish room and there is a listening chair about 8 feet from the amp/speaker set up. 

I’ve been intrigued by the Graham LS3/5 speakers…

The other components in the system:

• Gold Note DS-10 Streamer/Dac 
• Lessloss speaker cables 
• Cardas Clear Reflection power cable 
• Revelation Labs IC 
• Puritan 136 power conditioner 

The Luxman 590axii is rated as 30 watts of class a, but goes into Class AB up to something like 90 watts at 8 ohms. While that may be true, I’ve personally come to the conclusion this version of the Luxman shines best with an easier speaker load so it stays in class A. The Buchardt’s start distorting pretty quickly once the volume goes up. 
 

Thanks in advance for any suggestions!