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Since I always use Simplify3D and it has a handy axis offset capability for positioning the object(no doubt other slicing apps have it too), when an object's bottom is not optimal I offset the Z axis in the negative which drops the object below the bed a mm or 2. This is much easier and quicker then modifying the object's bottom. Another reason to not mod the bottom is some (like myself) may print this in 2 parts by chopping it across the middle using 3DCoat, Blender or Netfab. As such keeping the shape of the bottom is probably best as the artist intended.