Have a look at KEF Reference 1’s.
I tried to stay away from suggesting things other than what the OP said they are considering, but here goes...
This not a bad recommendation, but the KEFs might be too much speaker in a room that size. I have the Reference 1s as well as 30th Anniversary Compact 7s and did an extended (about 2 months) comparison between the two. The KEFs won in my room, but not by much. The KEFs do soundstaging better (again, not by much) than the Harbeths, which is a plus if you're going to be off-axis. Overall the KEFs are more dynamic, and are just slightly better in the areas of clarity, imaging, and as mentioned soundstage. Both are tonally pleasing, with the Harbeths having a slight edge there.
If we're going to toss other speakers into the mix, I recommend trying out the PS Audio Aspen FR5 speakers. They are a bargain at their price point and have very wide dispersion, which would be a plus with your off-axis situation. PS Audio has a very generous return policy, so you can do an in-home demo and return them if they aren't too your liking.
A friend who has KEF Reference 1 Metas recently did a shootout with the Ref 1s and the FR5s and ended up keeping the FR5s. While the KEFs are "better" in almost every way, they overloaded his small room while the FR5s created a much larger soundstage in his small space.