As well as the suggestion of an HD621 (I can’t tell from your sig what other sources you have) I would look at upgrading your centre if possible to a 5k either vertical or horizontal.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.