When I export my drawings to a PDF file (Adobe Reader 9) the lines appear a lot thicker than the original when viewing the PDF at the default 100% zoom. If I increase the zoom to a higher percentage the lines begin to become more in proportion with the original. I’ve tried different resolution settings on the Advanced export page, but still the lines appear ridiculously thick.

I want to send some drawings to a prospective client and first impression will look awful if I can’t sort this issue out. Any suggestions?