The automatic setting does something like a genuine fractals type of resampling. Try Bicubic (Smooth Gradients).
The automatic setting in
Resample picks differing sharpening algorithms just as if you select
Automatic in General Preferences (Image Interpolation), so, one for sizing up, one for sizing down and based on the image type. If you leave the interpolation option set to
Automatic, Photoshop will automatically select the Preserve Details algorithm when it detects that the user is enlarging the image. When downsampling (reducing) the size of an image, the Automatic option will choose Bicubic Sharper. Of course, you can override this to whatever you desire. Ditto with automatic setting and Free Transform.