AMP or Preamp

Replace the Yamaha and Rotel , for a Hegel poweramp, and even pre-amp. No McInt. Also a good option is a tube preamp.: Audio Note, Ear ,..
Also a very good match is GamuT and /or Gato.
Do you want an “American”: best option is Jeff Rowland. All those thinks gives a good sound with your Dac and speakers. For me the best matches. Try them first and  , make a choice.
Enjoy your music!!

You might try contacting Wilson and ask them what amps they use at shows to demo their speakers, where they'd be wanting to make a good impression. Not knowing enough to choose an amp for my Magico A3's,  I contacted a VP there and found out they were demoing these speakers at shows with Luxman 509 amps. So I figured I couldn't go too wrong with a Luxman even though I could only afford the 507 model, one step down. Did the same with the speaker cables.

The Magico company's president had recommended a Hegel integrated amp for the A3's in articles I'd read, which I'd also seriously considered. But Hegels being manufactured in China, where quality control is such an endemic issue, was too big a chance to take on a big purchase. 

Mike

Preamp.

I agree with the others that your speakers are not reaching there full potential with your current amplification. There are many good choices with different benefits. I have in general found separate amps and preamps superior. MacIntosh  offers high reliability, long tern serviceability, and good resale value. However I have not found their audio performance a good value. The suggestion to try a local dealer is likely to provide a lot of good choices

Hear the Wilson and Audio research and is good combination (tube amp).
also fans of Pass labs (solid state)
If space allow go separate for amp and pre .
Cheers