Cayin CS-55a integrated... which speakers?

I have a Cayin CS-55a tube integrated amplifier, that I used to combine with the Totem Arro (now sold) with satisfying results. but I must say it the the least interesting sounding amp in my collection. It really doesn’t go along with any of my speakers.I have both KT88 (stock) and EL34 (EH) and although powerful the sound it is always boring, not engaging at all.

That puzzles me because not only it is very well build and very well regarded in the Audio press and YT reviewers.

So CS-55a happy users, what speakers are you playing with?