Welcome, Jürgen.
From my experience, this hard landing is normal since they AP doesn't flare in any way. The real plane doesn't flare (in the actual meaning of "flare") too and only changes pitch very slightly, so it's "flying on the runway".
But since this small pitch change doesn't take place in the Sim (sadly), your descend rates might stay that high.
I don't use any passenger addons, so I usually get away with blaming my FO for the hard landing and hoping for some new passengers to board.  :P

Of course, the rw guys will state that especially Autolands are always "firm" to say the least, but 700ft/min are a bit to high for all the things in the cabin and especially for those which have to damp that bump, so you are right there I think.
Maybe one of the FDE Pros could rule that Autoland behaviour out. Otherwise, it will have to be fixed. On the bright side one has to mention that it always hits the spot, just like an Autoland should.