Suggest speakers with beryllium tweeters. I am very sensitive to sibilance too and a local dealer suggested the tweeters after I had issues with several different speakers over time. Ended up with Revels and I’m very happy. Went with the M126Be standmounts since like you I have twin subs and didn't need another set of tower speakers. There are other manufacturers that use beryllium so you have other choices in your price range.
speaker upgrade fever
I'm considering a speaker upgrade to compliment my Aesthetix Mimas integrated. Currently, I've got KEF Ref 1 monitors paired with (2) REL S/3 subs. Must stay away from bright, analytical and clinical presentation. Room size 12'x19'. Music is jazz, acoustic Americana, Chamber, symphonic etc.
Looking at the ProAc K1, Triangle Duetto and the DeVore o/baby. Also, a huge departure, Vandersteen Treo CT, floor standers. I understand Vandersteen pairs well with the Mimas.
Always open to suggestions, happy to buy quality used and demo.
Budget, ~$8-$11K