You are using stick fonts (SHX) except in your table which looks fantastic: these stick fonts are terrible and uneven and shaky looking. Any reason why you can't use professinal grade Windows TTF fonts? They ignore 'colors' and line weight settings and always print the same. It looke like your dimensions are set to a gray output, the others are set to black output.
Also, you are simply describing a PDF viewing problem in Adobe Acrobat with stick fonts: it's a display setting in Acrobat. In Preferences in Acrobat, you have to turn off Smooth Line Art and/or Enhance Thin Lines setting among otghers. Way too complicated to describe to everyone that has to look at your PDFs.
See attached: your gray text is still gray, your black is still black, but using ARIAL font for example this PDF is way more professional in appearance without the stick fonts.