PrimaLuna Evo 200 underwhelming

Wondering if it was ex display or a return.
I can't see bad pairing being enough to cause the problem you mention in a significant way. You could also try the headphone output to see how that sounds. 
I wonder if the tubes are nearing end of life. If it's been on display it could have also been running day in day out every day....

I have an Evo400 (upgraded from PL integrated HP). Have large KEF speakers and sound is fabulous (old rock, male and female voice, and some jazz). Upgrading center preamp tubes to NOS 12au7 make the most difference. Tried KT120 but went back to EL34 with fancy Sophia Electric. To me Gold Lion KT66 are far more musical (and cheaper than KT120 and Sophia EL34). Since you have PL and Tannoy, I would call Upscale Audio; They carry both and will suggest best tubes for that combination. 

I'm sorry I can't help with your issue but I had to comment on your speakers. I've not heard them but I did look them up and wow, they do some really fine cabinet work, very nice looking speakers.
https://imgur.com/a/l23dwsS

Thanks for all the great responses, if I could figure out how to answer them individually,I would. Some great suggestions and a lot to think about and work on. Just to say, the Robson Acoustics speakers are beautiful, as you can see on their website, they are just so difficult to partner and the Evo 200 just can’t do it. It is so frustrating because I think I have two excellent products but they just don’t like each other. I don’t feel that I should tweak with the Evo, since it is still in its 30 day return period and they have agreed to take it back for a full refund if I am not happy with it. Sadly, I think that is the way to go and then trade up to something else. Many thanks for all your help, you guys are awesome and I am absolutely hooked on the tube sound.

As strange as this sounds, I had a similar experience with a PL Dialogue Premium.
After 150 hours it still sounded disappointing (mostly veiled). Preamp was a Don Sachs...so no problem there.

My (nos) Carver TFM-35 was put it back in the chain. It was easily smoother, more detailed with upper end sparkle. Gave me a lot more respect for this amp. 
Decided to give PL one more chance and traded up (luckily at no cost because it's Upscale Audio) to an Evo 400. It sounded great from the first note and just got better from there. Not an ounce of hyperbole to say it was an ocean of difference from the Dialogue series. 

My take: There are a lot of people who swoon over their Dialogue series, so maybe some doped ones get through QC? Otherwise I can't explain it.

Also, I have messed up the phases on the speaker wires on the PL. As mentioned, very easy to mess this up on PL.

My Salk speakers are 88db/6 ohm and dip just below 4ohms. Sounded great using 4 ohm taps for a year. Just changed to 8ohm taps and I now get a slightly better presentation in upper midrange and highs... still have good bass slam.

I use Tung Sol 7581A. A little upgrade from stock EL34. More upper end sparkle, same midrange smoothness...a shade more deep bass. Less power though.

A word about Primaluna: if you're looking for ultimate in detail...look elsewhere. These are fun, smooth and romantic sounding amps with good bass slam.