Bear in mind that LH is pretty much the stingiest of all the *A airlines for giving miles, even within Miles&More. None of this is down to A3 - it's that LH does not pay enough (read: next to nothing or nothing) to A3 on a number of low Y fare buckets.
Hopefully the E fare bucket catches up at some point, but A3 has been a little tardy in updating earning charts recently (witness the SQ change to K class, where actually members might gain rather than lose).