Check and make sure your shutter speed is not above 200th of a sec, you may be seeing the shutter if you exceed the x-sync speed of the camera. Best to shoot at 160 anyway unless you are trying to balance background with foreground using shutter speed in which case you're going to be below 50th in most cases.
The shadow is caused by the lens and lens shade if you use one. If you are shooting "up close and zoomed in" regularly, get yourself a ring flash. It fits around the end of the lens = no shadow.
Other ideas::
Light it from below/behind or from the side. Put your 580 on wireless, and place it along side the subject. I recommend a reflector on the side opposite the flash.
Use a piece of white paper as your reflector.
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