Whenever I place Scene Capture Reflection Actors, they are always to small for an entire hallway wall that is reflective, and if I stretch the actor, the resulting reflection is blurry, and if I just have reflection actors right next to to each other, I always get this completely obvious cut in between the reflections. What exactly is the proper way of placing these.

you need to either scale it, or create multiple ones. i remember seeing in splinter cell conviction they had water on the floor reflecting the city around you, and there was one area that you could see a very apparent seam between reflection actors.