Your problem is one of scale: you are trying to squeeze a large plan onto an letter size sheet, then you want to zoom in real close and see perfection. That's never going to happen.
Your PDF sheet size needs to be much larger (try an E-sheet) and you need to set an actual plot scale.
Or do yourself a huge favor and print your letter size PDF to an actual sheet of paper that is letter sized to see the problem first hand. PDF is not magical, its just electronic paper.
Talk to your course instructor about paper printing, scales, and why zooming into a letter sheet size to see minute details is not how its done.
HTH
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