45 degree placement in squarish room?

I have an asymmetrical though not strictly 45 degree configuration I use with my OHM 100S3s in a small 12X12 room that sounds about as good as it gets.

No, in my case, they are not even close to equidistantand the orientation is more like 25-30 degrees than 45 and the right speaker is about 4-5 feet out to the right from the corner and the left about 3-4 feet out to the right of teh corner to the left with teh two speakers about 7 feet or so apart. My listening position is about 4-5 feet back from the speakers near the rear wall. Yes, use your ears to determine what works best.

"So, maybe the room is 50-60% of the sound after all?"

Whatever the number I believe it is high enough that it always pays to make it the primary thing to always keep under consideration.

Well, I'd opt for a larger non-square room as well if I had one.

Unfortunately, the room where I do this is only 12X12 and square accordingly. Given that, I have no complaints at all by any standard about the results my current setup delivers in that room.