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My two cents on this issue:

1)  Maybe the concavity can be seen if the lighting is right, maybe not.  
Throw a bucket of water on it (maybe with a drop or two of dish soap to cut
the surface tension and have it wet out completely) and see if you can live
with it.  If not, fill it and suffer the weight penalty.

2)  You'll need to balance the elevator if you fill it, but the big deal here
is that the balance point is proper, not what the total elevator weight is.  
More weight aft of the hinge points (filler) will require more weight forward
(lead).  There may be a second order effect on the flutter margin with a tail
that is heavier in total but by far the larger issue is the balance of the
elevator.  Dan Schafer is right on this one.

3)  I'd be flabbergasted if you could detect a difference in flying qualities
due to this small a concavity.  That's why I see no problem with filling only
the top surface (which is seen by everyone) and ignoring the bottom surface
(which is only seen by fanatics and showplane judges).

4)  Even as anal as I am, I would strongly resist buying a new one and
starting over.

- Rob Wolf
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