Congrats on the new house, and welcome to AudioCircle, Rfaul!
Alcoves, shelves and small cubbies are pretty nasty for speakers, they can really sound horrible! Even if you pushed speaker hard into the little corner to remove the gap you would have different radiation volumes around each speaker and different front wall reflection time from each speaker, which would mess up imaging badly. The other speaker has a wall to reinforce bass and reflect image on one side but nothing on the other side. You may be able to adjust the volume R/L to center the image but the quality of the image with 3 different time delays coming from the front wall first reflection will make good image difficult to achieve.
Most speakers are voiced to sound best when they are out from the wall by some specified distance, very often it is a couple feet. If you position such speakers hard against a wall they will have too much bass, and you could be interfering with the air flow of any rear reflex ports. Some speakers are design for on wall placement.
I would put the couch on the short wall and the TV and speakers on the long wall where the couch is now. Then you can pull the speakers out from the wall and as wide as you want. Distant side walls is another advantage. You can cover the window between the speakers as necessary. I prefer a hard flat wall between speakers (like DIY inside window "shutters") but curtains would work OK.
Another option is speakers against the short side wall on the right where loveseat is now. The short sidewall there is long enough to catch the side first reflection to make a decent stereo image, as long as speakers not pulled out too far. Or you could damp the side reflection on the other side. Otherwise it is symmetric and should do OK, after window is treated.
The feng-shui of my alternate wall suggestions is not as good as your current arrangement but I would gladly walk around a couch in middle of the room in order to have better stereo sound. ymmv LOL etc
