Is there anything in FE to account for this difference when using any FE model?
Again, CG. The correlation between latitude and measured discrepancies in gravity does not necessarily imply a causal relationship.
CG from what I can read, isn't really defined.
It says that celestial objects attract objects on earth causing things to happen, but that is like saying that wind happens because of the breath of the people. It explains it a little without explaining anything.
It doesn't explain the tides happening both under the moon and the other side of he earth.
It doesn't explain the latitude difference in gravity.
It feels like an excuse not to think.
You made it up, but all the unexplained phenomenon in it, and just left it as an unexplained answer to anyone questioning those phenomenon.
Wait, you basically do this with everything, adding properties to perspective because you can't explain them, and more.