Naim Audio system owners - What speakers are you using with Naim?

I’m a long-time Naim owner (252/SC/300DR); have Thiel CS3.6 speakers and Thiel CS2.4s. Naim/Thiel was a great sounding combination UNTIL I had my 300 upgraded to DR
about a year ago. Now there’s an upper-mid hardness in my System that’s driving me crazy. Regretfully I’ll probably have to consider other speakers because Naim DR/Thiel is no longer a match for me.