I listened to the Cheviot and the Turnberry GR 2 months ago at Upscale Audio. It was a close contest as they both have the expansive, somewhat dry Tannoy presentation. There was a little more articulation and sophistication with the Turnberrys. Cheviots won with the big bass moments hands down. But both seemed to have the same bass presence.
Had to go with my gut and chose Turnberry GR. So my advice to you is to go with the Cheviot. The Stirling has a 10" driver but with smaller voice coils and and with smaller HF driver.
Listen, you can't go wrong woth either...but based on my audition, the Cheviot was quite good compared to Turnberry. I imagine that the Stirling, with it's smaller box and driver coils will have less bass output than the Cheviot, which was, as I said earlier, near equal to the Turnberry is bass.
Not sure you will need to raise the Tannoys. They sound expansive and big enough that this may not be necessary. I get plenty of soundstage with them in a low lounge chair and the supplied feet.
They will need a good 40-60 hours to sound their best...so be patient.