What "wobble"? It's more likely that you do not have your layer size set properly. It needs to have a height to width a ratio of 1:2 and of course you need to work in a square pixel comp with square pixel assets. The rest is a waste of time. CC sphere is an intra-layer effect and does not interact with AE's 3D space.
Not an issue. It's a perfectly set up sphere. The wobble occurs because when I rotate the x or x the y's orientation is un affected. So the y stays spinning on an axis like this | and I want it to spin on an axis like /.
You just have to learn how to use the effect. Set the y rotation to get the tilt you want. Animate the x rotation. Done.
Or you can use 'Rotation Y' as your earth rotation,
and tilt it using both 'Rotation X' and rotating the layer (instead of using the 'Rotation Z').