see for yourself;).
the ball movement doesn’t look smooth because I recorded at 200 FPS and converted to 50 FPS, it actually moves perfectly smooth.
I think the reason your cam is acting like that (looking at your component setup above) is because you changed the position of the springarm (that’s what happened to me to:p), make sure the springarm position is right at the centre of your mesh (like in the pic below) and change the offset of the cam in the camera component settings instead.
ok:)
hope it helps:)
just out of curiosity can you tell me how your setting the mass of your ball?
–edit–
a little side note: my ball is a physics actor so I don’t know if you will need the camera target or not but what I said about the springarm should (fingers crossed) fix your problem (if you haven’t already fixed it), you might also need to change the Z offset of your base component so the centre of your mesh is on the grid like mine.