help vectorizing image

I need to create a vector drawing of this image.  The source scan is high resolution so that is not a problem.  I just need single color strokes outlining the black.  I have tried using different presets and different slider settings in the advance column but I can’t seem to get my needed result.  Illustrator seems to bow or curve the paths.  I have also tried the new concept/sketch to vector, and although some of the results are interesting, they are not what I need.  I am willing to put the hours in to do this by hand, but I’m not sure what the best workflow is… Any advice would be greatly appreciated.

Thank you…