I like this first attempt. The round shape doesn't work for me, though. I prefer a shape closer to that of the clip. (See image that is uploaded.) The "S" shape may work better if it were thicker.
I wonder what it would look like if it were silver over black, with a yellow "S" connected to a yellow outline?
Not sure I see the right color combo yet, but I like your work and will continue to look at it until I figure out what is the change I am looking for. Any ideas on a font besides Helvetica?