So this feels like two separate issues. dealing with the first, the camera centering, you may want to check your the component section of your TopDownCharacterBP. I’m guessing it might be working but isn’t centered, by this I mean that the spring arm component isn’t at 0,0,0 on the capsule anymore. A quick test with the default camera setup on it resulted in this for a rotation attached to the right mouse button.
The Mouse Setup for Reference:
Thats one of the nice things with the spring arm. that way you arn’t making modifications to the camera itself, like you do in the construction script.
As far as the mouse accuracy, I haven’t looked in depth at your video but I’m guessing its either a change you may have made to the mouse stuff, or its a side-effect of how your trying to pull your camera back. I modified my values as following to pull the camera back a bit to get that farther feel you are talking about as seen here… I changed the spring arm length, and then reduced the cameras perspective. I’ll try to add the images in a response here as I’ve hit the max size with the gif.