PDF Underlay Line weight and software to convert PDF to DWG

Hi,

I have 2 questions.

1)  Is there a way that I can control the line thickness of the PDF underlay?  I notice that when I pan around the very thin lines appear for the pdf, as soon as I stop, the line thickness comes back.  Could I disable line thickness for a PDF underlay?

2)  Can anyone recommend from their experience a good PDF to autocad file converting software for the MAC?

Thanks in advance!

Kevin

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